I agree with Fergus, tightness in a few key areas may be your major issues, also I am lucky I have small biceps, keeping the chest up is a priority as if you lose that posture your elbows will start to drop and then you will lose the heavy ones, I had a player once who was having problems keeping his chest up, we used a safety squat bar and did some upper back crunches for higher reps to see if that had an effect, in a standing position, maybe worth a try as well, light weights to start and keep the rest of the body tight and solid, cheers, ashley