I have to agree with Jeff, with the exception of one point.... with that short of a pin, you will have a hard time getting the cg low enough to put a weight hole in the thumb positive quadrant, because you will be fighting against having to much ending finger weight to be legal. However, everything else makes a lot of sense. Make sure that whatever drilling you do that you don't have to put a hole above your PAP.... that will reduce the flare of the ball, and I'm sure from what you've said that you don't want that. That means the pin HAS to be down.... do not drill that ball with the pin up, because you WILL regret it.