Your ball driller is wrong. Fit is based by your hand, and is individual to each bowler. You can have any amount of forward or reverse pitch in the thumb combined with any lateral pitch. Pitch is dictated by the size and shape of your hand. If your hand calls for those pitches, than pitch your gripping holes accordingly.
There is no, "you can't" in proper fitting of the hand. The hand will dictate what you need.
You may need to tweak the grip some, as you are looking for the custom fit that allows you to throw the ball with the proper pitches, maintain release versatility without causing any skin abrasions or hand pain.
Edited by Xx 12 X 300 xX on 3/4/2011 at 11:11 AM