Is he getting more exercise now he's feeling better?
How much food is tricky, the best measure if he is getting enough or too much is to monitor his weight and adjust intake accordingly.
How many calories in the food you are feeding?
He is running quite low for a kitty with no insulin, we have had kitties like this in the past, and it's normal for them. I wonder if he is getting more exercise than he used to now that he is feeling better??
My experience with George, who is a complete foodie, is that once he has got regulated and off insulin he is no longer as hungry as he used to be, and has a more normal appetite, that said George went into remission, much more slowly than Grady, and had time to get used to his BG being in a normal range, I wonder if for Grady he still perceives these lower ranges as 'abnormal' and that's why he is asking for food, because his body thinks he is going too low.??? (just pondering on this)