Well, I would suggest you do a bit more research about diet because you are feeding way too much protein and way too little produce (dry fruit doesn't count as 'good' because of the lack of moisture and preservatives). I would also discontinue the High Potency Pellets... there used to be a warning on the label of this produce indicating that they are only good for up to 6 months of continuous feeding, never more, and only for birds that were breeding or had been under a real bad diet as it was meant to be a 'transitional' food only but, for some reason, they stopped putting the label on them and now people are feeding it every day. The thing with commercial food for birds is that it's completely unregulated so they can tell you something is good when, in reality, is terrible for them...
My grays don't like the leafy part of the leafy greens, either, but they like the crunchy stems so offer the very heart of the romaine, bok choy, chard (they love the red Swiss chard but be careful not to feed it all the time because it's very high in oxalic acid), raw broccoli (this is, by far, their favorite!). rapini, etc.
Try fruit like oranges, cantaloupe, watermelon, etc. (my grays love 'juicy' stuff, they actually suck the juice out of things) and pomegranate seeds, blueberries and blackberries (all favorites). It takes time to get them to eat a large variety... I had a gray that took five whole years to taste her first blueberry even though she got them every single week! In my personal experience, grays are one of the pickiest species when it comes to food - and very stubborn about new things and about how things are given to them. Sophie CAG would only eat certain things if I stand in front of her (with her perching at my head level) and hold the stuff in my hand so she can take the tiniest bites out of it (just like a kid who is eating something he doesn't really want
As to gender, look at the tail undercoverts (the shorter feathers that cover the beginning of the long feathers under their tail) and see if there is a very thin grey edge to them. Grey edge means female, no grey edge means male but, sometimes, you have to look super carefully because if the feathers are worn out (as they would be now) and the edge is very thin, you can miss it.