Spinners and Haus machines can be the absolute enemy to a cover stock finish. They are great for polishing, and resurfacing, but just touching up a ball is best done by hand. You can control the motion so much easier.
The other issue may be the usage of the abralon pads. They change very quickly. Use a permanent marker and just place a little line on it, so you know how many times it has been used.
To just touch up the surface, use water and a NEW 4000 abralon pad, by hand and hit all 4 sides.
To bring it back to factory, hit it with a new 500 on all 4 sides, followed by a new 4000 on all four sides using the slow speed of a spinner. After it comes off the spinner, touch the cover again with the 4000 by hand.
Todays bowling balls have so many peaks and valleys. When using a spinner, it is real easy to be counter productive, and actually sand the RA value down. Using pads by hand offer more control, and will glide over the tops of, and get down in to the valleys a bit easier, allowing enhancement of the RA, rather than cutting them down.
Tommy Gollick
Storm Regional/Pro Shop staff
Red Crown Pro Shop Harrisburg, PA
stormbowling.com