Matt,
The problem many of you may be facing with the RS-X is in its factory polish. I'm not sure what they did at the factory, but I believe what I originally saw in mine is what you have seen. I could hardly get mine to handle even medium-light oil and that surprised me. I had told Mark C that in private emails and noted how for such a supposedly strong coverstock I was disappointed. So, as I always recommend, I modified the cover.
(Note that I used one of my favorite drills on this ball also, 5" x 4", pin just below the center of the bridge, CG kicked out with no weight hole.)
At first I just sanded it to 600 grit. Now it hooked at my feet, on the same medium oil on which it had previously skidded about 55 feet, LITERALLY! Now there should not have been that much difference. Gradually I polished it back up to its original gloss finish, with Storm products, mostly Xtra Shine. The reason I kept polishing, insted of staying down around 800 or 1000 grit polsihed, is that it was still going too long. Still its ball reaction was much better than the original's finish.
I strongly suspect that the original finish has some kind of friction inhibitor besides plain polish. My ball is now back to the same level of shine as the original, yet it is much stronger than the original.
As far as I know the RS-X and the RS-1 have the exact same core, but the solid cover on the RS-X, Sure Grip Extreme, is supposed to be able to handle almost any amount of oil, depending on the finish. The RS-1's cover is the same as the original Silver Streak, except pearlized. I'm sure the RS-X's cover is stronger than the Silver Streak's.
If you feel like experimenting, try what I did. If it doesn't work, just polish it back up to the factory's 1500 grit and you should be back where you started. But I think you'll find the ball is now stronger than before, even if you did polish it back up to factory specs.
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"None are so blind as those who will not see."