I know I should be able to find this simple answer, but it escapes me at the moment.

In the old days, the rule of thumb used to be that minimum top weight was preferred for oily lane conditions in order to get the ball to turn sooner, while more top weight pushed the ball down the lanes and seem to continue thru the pins better.

Notice that I said "in the old days". These days, what (if anything) can be attributed to a ball with the maximum top weight after drilling as opposed to a ball with zero top weight or slightly bottom weight.

Thanks