The first thing you mentioned was the new pins, usually they can take a few weeks to "break in" with their smooth and flat bottoms.
Secondly, before putting anymore polish on the ball, have you tried any small line movements...ie...half a board up, back, left, or right during the night? Have you tried to lower your track/axis, and spin the ball more, even changing the angle of entry yet?
It's possible the extra oil is creating carry down problems in the back, which could generally reduce carry as well. If it's carrydown that could effect your reaction later on, polishing the ball may not be a good idea because it could skid more. It could be you might just need some surface before you decide to polish the cover.
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