i understand how the bump and run coverage can take away the slants. but, here's what you could do. you said he has the flats covered. try going into a shotgun set with two backs, and put a halfback in the fullbacks spot. one of them should be open. also, you could try slide protection, hiking the ball before the nano is set up, and motioning a WR/TE behind the linemen and hiking the ball so he'll stay in to block. one of these should work.