Today I figured out another reason why I have trouble hitting through the ball and I think this one is big. Maybe it will help someone else out if I explain it. If you hit a lot of topspin, frame a lot of balls, have trouble hitting through the ball, and have trouble hitting flat, chances are you may be doing the same thing I was. Today at the wall I was specifically concentrating on extending through the ball. Things weren't going well, so I decided to just try and hit the ball flat no matter how akward it felt. After an hour I was doing well and was trying to groove the feeling and understand what was different. I realized that in my normal swing, I drop my hitting shoulder at the beginning of the forward swing and then tilt my torso sideways sending the the hitting shoulder upwards. This must be a natural habit I developed to hit topspin. So basically it's like I go down for a side bend as I'm starting to swing and then come up from the side bend at the same time my shoulders are rotating. Or another way to put it is that I would project my shoulder more upwards than forward. I hope this make sense because it seems like a bad topspin habit that is probably easy to pick up.