Thanks for the great replies, I really appreciate the information. I just thought I would let you know what I ended up with.
I went with a combination of advice here. I got a variable speed (1000-3000 RPM) polisher/sander from harbor freight, it is an 11amp motor so it turns 2 stacked 8" buffs at 3000 RPM with no problem at all. To mount the wheels I did as suggested by welding a 5/8" nut that fit the polisher to the head of a 1/2" x 2" bolt that goes through the buffing wheels, it is perfect for stacking the 2 wheels on. The best part is that the polisher was on sale for $30!
I can't believe the difference this makes, not only do I have the speed I need but I can apply pressure without slowing the motor down. I'm very happy with the results I am getting now.
Thanks again for the help, hopefully this info will be usefull to others as well.
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