Welcome back Jeff.
Rougher surface will cut down on the backend of a ball. Problem is, it will tend to hook earlier.
2d problem, are they allowed to sand the balls during league?? What happens when he sands the ball down to combat the backend reaction and his line dries up.
If he's used the Break all year, the surface is probably worn down to around 600 grit now.
If he's scoring well with the ball in it's present condition, I wouldn't mess with it. Learning to adjust is just part of the game. Also adjustments are more versatile than trying to second guess the lane conditions with surface prep.
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Charter Member FOS
Have Balls - Will Travel