Your process just needs to be modified, along with your tooling in my opinion. You should be polishing at between 2500-3600 RPM or so with 4-6 inch wheels. I personally use a 3450 buffer, with 8 inch sisals and 6 inch spiral sewns and loose wheels. Your 2 biggest problem are your tool speeds, and the fact that you're not using a sisal. 75% of the real polishing should be done with sisal wheels and black emory/super sisal compound. I dont even use brown, i go right to white after black. I suggest picking up a bench top buffer as your first step. Here is a pic of a few things i've done using the above mentioned method (black on a sisal and white on a loose):
http://www.trgperformance.com/NewPics/Polish/b16a6.JPG
http://www.trgperformance.com/NewPic...6fuelrail2.JPG
http://www.trgperformance.com/NewPic...22plugcov2.JPG
My camera is horrible and as we all know polished parts NEVER photograph well. Good luck.