Their is no way that ball is burning up even at 500 grit plus polish the overall surface of the ball is going to be 4500 to 5500 I can't burn that up at my speed unless I throw the ball in the dry then anything will burn up including plastic. As to the Colombia cover stock strength I really have no idea but I can't figure out why Hammer can have fine aggressive covers and Colombia can't since both are EBI companies but I've never owned one and really the only higher end Colombia ball's I've seen anyone throw is the Mad Antics and the Meltdown both of which looked ok but nothing special to me.
Hitting the ball by hand is not the same thing as putting it on a spinner
RG has nothing to do with the amount a ball hook only somewhat to where it will hook on the lane.
Having three polished pearls with Rg's of 2.51, 2.53, and 2.56 sounds like a way to build an arsenal of the three balls that do the same thing and have no ability to handle any oil. you can do it on a THS maybe unless you run into the THS's I've been seeing here lately that have oil outside of 8 then your dead meat.
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