It sounds to my like your feeding him too large of meals and too many. A five month old snake shouldnt be eating small to medium rats, especially two of them. Try feeding him just one adult mouse per week. As for the aggression I dont know what to say, non of mine are aggressive and the ones that were got over it pretty quick, I just held them more and got them accustomed to seeing me and being held. I wouldnt worry about stressing him out, if you just leave him alone its probably going to get worse.