BT,
I have two XXXLs. One drilled for 10 pins, still too much ball and one drilled for a strike bll on short oil with strong backends. Of course there is not flip, but the ball with the strong core does move several boards and hits very hard. Speed is important though because if I threw it too fast, I pinged a lot of 10 pins. But I have not experimented with sanding the surface.
V/R,
Nicanor