04-08-2014, 03:19 PM
This has always been my thoughts on the matter, but it could be wrong.
Where you strike the CB does not determine the tangent line. It's where the CB makes contact with the OB that determines the tangent line.
So on shots with side spin (especially over certain distances), the contact area on the OB will be different when using left or right spin, then it would be with center. Now if you played a short distance shot where the spin might not have time to take effect, then the tangent lines would be the same, because the contact area on the CB wouldn't change.
Same goes with hitting center on the CB, but playing the OB to different parts of the pocket. That will also result in a different tangent line, but it just goes back to the fact that you're simply changing where the CB contacts the OB.