I have heard rumors that the extra "friction" was created by some sort of mild/soft particles. If that is true, I would try to make sure you used nylon pads and not sandpaper or diamond studded grits in the machine, if at all possible. I'd personally be afraid to use anything but nylon pads in re-surfacing such a ball.
As always, the best thing is to go to the source: Columbia and ask them for th ebest procedure.
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Bowling: Wish I could help me as much as I seem to help others ...
Life ... is what you make of it. No, really!