ive been having trouble with a certain wrestler at my gym, who outweighs me by quite alot and has much more strength than me to match. we were doing a drill where my job was to maintain side control with an over/under grip, and he would just explode his hips up and roll me. it started to get very frustrating. however, he did have to crossface me to the point where his arm was practically extended, and i saw quite a few chances for armbars that i didnt take cause we werent supposed to be trying to sub. so do you guys have any pointers for holding down side control on a larger, stronger opponent? would i be better off using a mount or knee on belly?