The pearl is not his friend on heavier volumes of oil. It lets the ball skid too long and that particularly is what is keeping it from getting into a roll sooner. A dull solid as someone already suggested will help, or a light particle load ball (heavy particles help read the midlane, but they typically don't move strong in the back when encountering friction. Great for Over/Under and tough stuff, but its probably not going to benefit your friend).
Pin down drillings are the way to go for earlier roll. And with him being a lower rev player, I suggest a lower RG value ball
(the lower the RG, the quicker the ball revs off your hand. ex: 2.46-48 better for him VS 2.52-56),
and a higher RG Diff.
(the higher the differential, the more track flare the ball will have and that will also help the ball read the condition faster in the oil with cleaner surface area.. .050-.056 VS .030-.045).
Stronger Mass Bias balls will also help him turn the corner. But I'd suggest getting a good ball driller/coach to work with him a bit and make sure the ball is layed out for him using his PAP and fitting his style of play. I've seen too many people pay for higher end balls and hate them because they didnt do what they wanted them to do, and its because the ball wasn't layed out properly for them. Not because it was a "turd" or whatever.
Good luck on getting him something he is comfortable with.

Later,
REvans284
Edited on 6/7/2008 11:48 AM