Don't be afraid of speed 6, just have to be careful that the pads don't overheat--someone here suggested using 2 sets of two pads--after a couple of...
Griot's Garage Dual Action Polisher with 5" backing plate, has more power than any of the other standard DAs and a lifetime warranty--Buff&Shine pads...
The mitt can make a big difference--take a look at the CarPro Sheepskin mitt (up a couple of sections and you can get to the website)--it's only $20...