Well, with a heavy flat pattern, I don't know if a Rule in general is the right ball for you. I know when I hit the HEAVY stuff, flat or not, one of my dull Animals or the Phenom is my first ball out. Dull particle cover to help it fight the oil. The Rule is more of a medium- medium heavy ball. If you have it polished still, knock the polish off. The new GP2 would be a good choice as well, but I do not have mine yet. A new ball for you may be your best choice. If that is not possible, sand the Rule to different grits until you can get a reaction that will work for you. As you probably already know, Track balls in general take cover chandes very well.
Don't hesitate to ask any other questions!
Clint
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Clint Daley-Owner
Lets Go Bowling Daley
Salem, Ohio 44460
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