Strip your rig down and get into a pool.tank regs and bcd and check it. If theres no roll then you can start installung gear and see were your problem lies. My BM rigs are heavy and ive spent more then a few hours figuring out were everything needs to be to stay trimmed they way i want. IE.Spot A may be were you want that cann lite but you may need to add an extra lb opposite to trim out.