I get you point about the peeks and valleys, BUT when a ball has polish, it keeps the energy in the ball and saves it for the dry part of the lane! A ball can lose its hooking ability, and I have seen it happen, when the polish is removed! If you looking for that flip motion, with a pearl ball like the IQ pearl for instance, take the polish off and its a dog,,, no flip, burnt out before it gets to the hook stage of the delivery!
So polish does have its place, and a ball will behave differently with a 4000grit and lets say a 4000 with polish! My Virtual Gravity Nanno Pearl works great on fresh house oil, with a 4000 and polish. Great Flip, but if the oil on the lanes is light, or dry it burns up before it even gets there, with much less flip.
Some balls need oil, to get throw the heads, and polish seems to help on some balls, like my IQ pearl, and Virtual Gravity ..... the more polish the bigger the flip.
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