OK that probably didn`t help all that much. It really isn`t the speed of the pad when using an orbital, but the part of the pad that is most effective. The nature of orbiting is prevent the pad from staying in one spot, like a rotary. Since it orbits and oscillates, the center of the pad is going over the same paint more than the outside edge of the pad so the center is doing the most correction. I made a little diagram which may help a little, hopefully . Again, the slow and fast is a lack of better words to use...
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