Yer I think your right, my upper back is probably just a bit weak. Are there any accesory exercises I should be using?
Another point I should add is that my lower back is rounding. Should I be bracing my abs before descending?
Im using the clean grip.
Overhand pullups, DB Rows, and Rear Delt work. Thus is what has brought up my Front Squat the most in terms of upper back stability. Are you training for Oly lifting? If not the cross arm position or personally I just hold my arms out straight would def instantly increase what you can handle in the rack position.