Do you own a video camera? There can be a lot of reasons on why you pull the ball across your body. You'll be surprised at what you see that you're doing wrong as opposed to what you think that you're doing wrong. The camera doesn't lie. I own one myself and when there's something in my game that is either out of whack or in a slump I can see exactly what I'm doing and made the necessary corrections.
COMMON FAULTS OF PULLING BALL ACROSS YOUR BODY:
1. Fast Feet
2. Trying to help the ball and not letting ball do the work.
3. Bent elbow
4. Late timing- ball ahead of body
5. Tight thumbhole resulting in the ball not coming cleanly off your hand at the point of release.
6. Drifting on the last step.
7. Push away left instead of straight to target.
8. Bending too much at the waist.
Go thru this checklist as you playback a recording of your bowling at a practice session. It sounds more to me that you're bending at the waist. Flex your knees at your stance and at the point of your release your left knee should be bent as if you're sitting on a chair. But you should also at your stance lean a little forward with your shoulders. When you are at the point of release your shoulders should be slightly over your left knee. You should have someone video
tape you from three different angles. Five video shots at rear angle. Another five shots at side angle and five shot at front angle. In order to have the frontal angle shot successfuly you should if possible have the person at the desk to put you on the very last lane, because you're a right hander. I hope this helps.
Sincerely,
Mary Allen