Hearing those things is encouraging

Yes, the behaviour is exactly what you described. I hope it will decrease in time (hope it's not because of improper weaning or something). I do think it's decreased a bit in the last couple days...
Did you have any problems with aggression with your g.c.'s when they first came to you?
No go for the gloop.....

I've been praising when he picks any up and making like I'm eating it myself, excitement excitement, but nooooot yet. So far it's been in an hour and 15 minutes. He has picked around a bit, and nibbled here and there. He really likes sweet stuff, and I had put miniscule pieces of banana in there that kind of mooshed into the grain as it thawed (I've cut up fruits/etc. and frozen them). I wonder if I try a touch of (pure) maple syrup mixed in... I was feeding him corn through the bars with my fingers right by the dish and he even dropped one in, but wouldn't take it out and keep eating it. He's just not keen on it as of now.
How should I proceed throughout today with the food? It's still in his dish - when should I take it out and what should I feed him until "supper?"
He is really spooked this morning. He seems to have a thing with light... changes in light. I wonder if she kept a light on for him all the time. I will ask. I remember when I went to pick him up, she opened the blind (the type with the slats or whatever) and he got scared and flopped all around to the floor. He is really distressed right now. I tilted the blinds up so he can't really see out the window, but still distressed. It's as if it's nearing nighttime - this is what he does. Chirps incessantly and is very agitated, frightened.......
I wonder if he is hungry right now and it's making it worse... Yesterday he was really good (comparatively) through the day with me sitting here. Not today

Reply to Wolf: Thanks for the suggestions, much appreciated. When you say push his beak to the side when biting, I don't think that would be possible at this point. What seems to happen is he gets "irritated/enraged" when biting and once he starts he is on a MISSION. All you can do is try to get him off. Thoughts? He CLAMPS... Also, I am going to start working on that, having him come out, THEN step up. (Going to start with T stick first with treats. I've had it laying by the cage for the last couple days as, I think, Pajarita suggested. Was going to give that a go last night, but decided to wait.) Yesterday he was only out of cage twice in evening (I sat with him for several hours). He was ok, no catastrophes with biting because we avoided it and limited the time. He was on our shoulders. Have kept hands away since the 'big attack.'
Reply to cml: Hello and thank youuuuuuu. I really think you are right - I can understand and agree with what all of you have said - and I think you are right that cage time is good right now. I took that advice and have been spending a lot of time in this room sitting with him (several hours each day since you suggested it, so this is day three). He is started to "know" his cage now, and yesterday and the day before he was really quite good in there with me here... he seemed 'ok,' quiet, we talked back and forth, etc.
Today however, step back it seems
Questions:
1. Is there something I can do when he is like this, really distressed, to comfort him?
2. Is it possible that he is hungry right now?
3. How do I go about dealing with his food for the rest of the today (see above for explanation/questions)?
4. I have a fluffy thing tied to the side of the cage by one perch and he has been sleeping there/going there for quiet time. Is this ok at least for now...? Thoughts on this sort of thing?
5. Are rope perches no good? I don't like that I can't PROPERLY clean them...
6. Any suggestions how to work on taking his dishes in/out (they're on doors that open and swing out for access) without him lunging and snapping? It's always a mad dash to do it. Most of the time the only way is to open the top and have him away so I can do it (at least allows me a little more time to do it, as it takes him longer to run to bite my hands from the top as opposed to inside anywhere...).
He is on the bottom of his cage right now

I think he must be hungry.... ugh
He's back to snapping at my hands through the cage again today. Yesterday I was able to do a couple things to the outside of his cage, verrrry slowly while talking to him, without him lunging.
Update: I washed out his dish and put about a tbsp of pellets in - and he's eating like he's never eaten before. ugh. Making little prrr sort of sounds, I've been assuming these are 'happy/content' sounds. Try again tomorrow with a little maple syrup I'm thinking. (Other suggestions to try to help the transition?)