Thumb weight will affect pancake core balls;. It will not affect dynamic cored balls like the RS-X. WHat will affect it is where and how you place the weight hole to remove the side and thumb weight. Plug up the weight hole you have and place a weight hole in line from grip center through the marked CG, a distance of approx 6 3/4"; I'd take it back to 0 or 1/4 oz side. With any luck that will be 2 1/2" - 3 1/2" below your PAP. That will add some earlier flare to the ball.
Unless you have a mammoth amount of revs, a polished solid resin is not likely to be anyone's heavy oil ball. If you decide to do what I suggest above or even if you don't, take a green or maroon Scotch-Brite nylon pad to the lanes and try to practice on an amount of oil similar to what you bowl on. Use the nylon pad to alter the ball's surface by hand, a small amount at a time. The first change should be easily noticeable, but don't go too far. This cover is still decently strong. YOu should notice a change in ball reaction immediately but it may not be enough. COntinue to make small changes, testing each one several times to insure you know and can see what's happening.
I think if you take a grey pad to the entire ball immediately with a spinner, the change may be much more than you wanted. A little patience may be necessary the first time you do this, especially since this is a new ball. After a time, you should more easily recognize how much surface change you need/want.
Good luck.
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Bowling: Just like hand grenades and horse shoes, you only have to get close.
Life: Deal with what is.
Edited on 9/21/2005 12:18 PM