something very simple - when you setup - make sure your shoulders are sqaure or slightly closed. I know I have a tendency for my right shoulder too far foward at address which prevents me from rotating the shoulders properly. I get on a steep plane and tend to pop drives. Set up with ball at your left armpit (assuming righty) and feel almost as if the left side of your body is next to a wall. Right shoulder may feel back a bit. On the Backswing keep the left arm-body shoulder connection and simply tun you shoulders. Hope this helps.