ts7299 -- If you don't already know the answer to your question, you really need the personal help of a competent ball driller.  Talk to the better bowlers at your local center to see who is drilling their balls.  Select the driller you think is the best and go to him.  Explain what you want the ball to do and review the manufacturer's drill sheets.  If the driller doesn't ask to see you throw a few shots and check your PAP, I'd try someone else.  When the two of you have selected a layout to use, the driller will know what specs to request when he orders the ball (unless he happens to have one with the right specs in stock).  This might cost you more than an internet purchase, but you'll be better off in the long run.  --  JohnP