Well If im taking into account the things you mentioned I would say that it may be the ball has probably absorbed its limit of oil and needs to be baked to get the oil out.
How often do you resurface the ball though? It may be nice and clean but if its suppose to be at 2000 and its been 3 or 4 months than its probably not at 2000 anymore. The lanes are around 500-1000 grit i believe(got that info from my friend who went to the USBC in Texas for a lesson) so prolonged friction against lane will dull the ball.
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