Oh, my... the white blobs in his eyes are actually cholesterol deposits and that means that his cholesterol is super high and, I am afraid that this also means advanced hepatic lipidosis so I am VERY surprised your avian vet did not do a bile acids test! I mean, I am not an avian vet but I have quite a lot of experience with liver issues (only one had cholesterol deposits in her eyes, also an amazon, a female lilac crowned - I ran a bird rescue for 6 years) I would have done that first of all because you need to know exactly where you stand with his liver. If I were you, I would not wait until the 'next visit'... well, maybe I would because vet visits are extremely stressing to birds and that's why everything should be done at one sitting (again, very surprised at your avian vet's lack of foresight).
You need to change his diet asap and eliminate anything that is high in protein and simple carbs (no white flour, no sucrose) and start supplementing him with liver cleansers and tonics ASAP. But, please, I beg you, do NOT, under any circumstances give him mammal meds (statins or any other cholesterol reducing med or allopurinol) for his cholesterol or high uric acid. You also did not say what the omega cocktail has, please do because it could be making things worse - although, in all honesty, my first recommendation would be to stop it immediately and go the natural route. I know it sounds ignorant to tell you not to medicate the bird but in my personal experience and going by what other people with birds that had the same problem have observed (we have a member here whose rescued bird died after being medicated with statins), the mammal medicines end up killing them (they are processed through the liver which is already severely compromised) while the natural route keeps them alive. Not healthy, mind you, poor Rico will never be healthy but he can have a few more good years left. Mami Zon, the one that is calculated to be over 50, came to me with advanced hepatic lipidosis over 10 years ago and she is still going strong... plucked and duck-tailed because her tail feathers never grew back but loving her girlfriend, Naida, eating, pooping, singing her TRA LA LA every morning with my CDs or radio and saying 'I love youuuu!' when I tell her to stop screaming 'HIIIIIII!'
Now, as to recipes (I'll tell you about the supplements I use below), there are several gloop recipes in the diet section so you can look them up but gloop is, basically, a dish made out of whole grains cooked al dente (because, this way, the grains are soft on the outside and infused with water -VERY good for them- but remain separate and a bit hard in the inside and this is the way parrot prefer them) and mixed with frozen or canned veggies. I use organic when necessary and non-organic if the item is on the 'clean' list (there is an independent organization that tests all the produce and puts out a list of the dirtiest -meaning chemicals- and the cleanest produce for the year. This is their site:
https://www.ewg.org/foodnews/summary.php and they will be putting out the 2019 list soon) but I will state it on the list. For grains, I use aoat groats (and I recommend you use more oats than other grains as they are excellent for cleaning up cholesterol from the system), kamut, hulled barley, wheat (but you will want to use the soft white spring wheat only because it's lower in protein than the others), red and black rice. I also use black or brown lentils but you might want not to so your gloop is lower in protein. Once they are cooked, I allow them to cool and then add frozen veggies (they should be added frozen to retain their higher nutritional value): regular chopped broccoli (make sure it's the 'chopped' and not the one in pieces because it's the only way they eat it, otherwise, they pick the piece and throw it out), organic corn, organic carrots (diced), organic peas, regular sweet potatoes (they are not frozen and are either nuked in a Potato Express bag or baked in the skin -I peel it after they cool and chop into pieces but not too small or they become puree), frozen regular butternut squash (diced), regular giant white hominy (I've never been able to find it organic so I buy it in cans, I get a brand called Juanita or something like that because it's the lowest in sodium but I still rinse it thoroughly under running warm water) and regular frozen artichoke hearts (chopped - don't forget them because they are excellent liver cleansers). Then I split it into daily baggies that I freeze. Every evening, I take out one baggie and leave it outside to thaw, in the morning, I nuke it so as to take all the cold out of it and mix it with the flavor of the day (their favorites are cinammon -make sure you get the Ceylon one, not the 'regular' and use it VERY sparingly because a lot is not good for the liver- and chili but they also like ginger and 'italian' -garlic, oregano and black pepper- a lot).
You should take out all the food out of his cage once he is asleep in the evening and, after opening the door to his cage in the early morning (I am doing it at 6:30 am now but it will be needed to be done earlier and earlier as the days get longer), put out the raw produce (do one piece of fruit, one veggie and one leafy green or cruciform - I suggest you start with the 'sure things': apple, fresh corn on the cob (yes, they are expensive this time of the year but they LOVE it! and either raw broccoli or some sort of 'crunchy' green like bok choy, the very heart of the romaine, Swiss Chard because that's what they like best. Do only one of each, don't give him a choice because, if you do, you will find that he will only eat what he likes best and leave the rest. Eat with him by standing in front of his cage and taking a piece of fruit into your hand. Do not offer him any, just stand there and pretend to ignore him while you 'enjoy' your food by making yummy noises. Then, an hour later, give him his gloop. Start by making a simple grain gloop with no veggies and mix the tiniest sprinkle of budgie seed to it. He might not eat it the first day or the second but, eventually, his hunger and the fact that there are seeds in it will tempt him enough to start eating the seeds and, later, trying the grains. Once you start finding things that look like empty white skins, you will know he is eating the grains. And, once he starts with the grains, you can start adding veggies to them, one by one and gradually, always waiting for him to eat them. Start with sweet corn (they all love it and all my birds go first for the corn in the gloop - from the too to the budgies), then peas, then carrots, etc. Don't worry if there is a lot of leftover, it's fine. When you cook the grains, you are infusing them with water which makes them grow so even though they might eat a lot of gloop, it's mostly water (which is exactly how they eat in the wild) so they never gain any weight on it and yours will actually lose some - gradually and without him going hungry at all. In the evening, when the sun is halfway down to the horizon (around 4:30 pm this time of the year) turn off the ceiling lights in the room where he is kept and, about one hour later, give him his dinner - I would give him 1.5 level measuring tablespoon of budgie seed because you need to reduce his protein intake dramatically or his liver will not be able to function. The liver is one of the 'filters' of the body (the others are the kidneys) but another function is to metabolize protein so the less protein it needs to process, the better it will be for him - besides, any excess of protein eaten that is not used by the body becomes fat and ends up stored in the liver (the fatty nodules of hepatic lipidosis). He should get no protein treats whatsoever (no nuts, no seeds, no nutriberries, no nothing) but a life without any treats is a sad life so make him some nice birdy bread with whole grain flours and lots of veggies and fruits in it or some nice healthy oatmeal cookies (you can mix it with pureed squash, put little balls of it on a cookie sheet and bake them at low temperature until they are flat, nice and crispy) so he can have a little something special.
Now, as to supplements for liver. I use liquid non-alcoholic milk thistle and dandelion root extracts in the water (half a dropperful of each in about 4 or 5 oz of water - it will turn dark yellow first and brown later but they drink it without a problem) and capsules of milk thistle, dandelion root, methionine and theanine in their gloop. Now, I use two capsules of each BUT I feed a lot of birds so my gloop bowl is about 7 big laddlefuls so you will have to use much less (maybe 1/4 capsule for the first 4 weeks or so and then reduce it to 1/8 of each). Now, he is going to need a special diet and the liver supplements for the rest of his life. The liver is a noble organ, the only one that actually regenerates itself, but once they reach advanced liver malfunction (and yours has it!), you can't turn back the clock, the only thing you can do is keep on helping it function enough so the bird stays alive. Because of his high cholesterol (indicative of him having being fed animal products, I am afraid), you will need to add some red rice yeast and some coriander (capsules, not the fresh cilantro because it's too high in oxalic acid but you can also buy the seeds and grind them) to his gloop but the main thing with cholesterol is to feed high fiber and high moisture (and that's why not even Tops pellets -which I do agree are the best of the pellets out there- are any good for him).
Let me know if there is anyting that needs clarifying or elaborating.