I am so glad George is getting a second chance! I have 2 f2s, and you are right, the affection these guys show their people is nothing short of amazing.
My boy just turned 1 and he has never liked the pate canned either. I wouldn't worry so much about amounts as his body heals, especially getting healthy kitty food. If it makes you feel better, my boy eats more than most tigers, I think. He gets 2 6oz cans of Weruva Peking duck, paw lickin chicken or stake frites, all human grade, shredded meat in a little gravy. This is just in supplement of his raw, the main portion of his diet. I feed frozen, prepared raw mainly from Primal to ensure all the bones, organs and appropriate supplements are ground up in there. I am sure he is eating closer to 20 oz of raw, and he is still quite thin. When growing, that raw goes up even more, I am not sure where he puts it all! My girl, who is about 2, won't eat canned at all. She is strictly raw and eats about half of what Kovu does on his slow days. We don't have dry, Kovu never ate it. Nyah would eat a little Orijen but not enough to make it worth having. My cat food bill does rival my human food bill! My husband claims it is more, but I think he is just being dramatic.
I am lucky in that I work from home most of the time so I can feed multiple meals of raw a day. I know not everyone has that luxury. Keep posting pictures! I can't wait to here stories of how he was worked his way even more into your heart.