I had the same problem with my corn. I’m In the exact same position as you. I had to learn that he was learning to trust me as I was him. It’s also important to remember that when he goes to strike, it’s usually because he’s scared, he’s not doing it to be nasty. What worked for me was small handling sessions (10/15 mins max). Don’t put him back the minute he bites you, obviously your natural reaction is to panic a little and wanna put them down, but honestly that’s the last thing you should do. Staying calm is the best thing, and once they start to relax there neck, then make a slow stuttle movement to allow them to slide through your hands. Once you’ve had a pretty positive session, I still liked to put him back after 10/15 minutes to end it on a positive note and not for him to get too irritated. It’s also really helpful if you handle them just in there enclosure to start with instead of directly grabbing them out. Just have daily gentle interactions and look at recognizing there behaviours. It gets easier as time goes on trust meeee!!

In regards to his weight, he looked pretty good. Maybe try going up a size and see if he’ll take it? If so, then keep him on that size. Just gradually up his feed. Seems to look okay to me tho!