A couple things... If you are unsure of what the speed dial on the PC means, then I'm not sure if
Meguiars' is the problem or if your lack of experience is the problem. The reason I say this is not to insult you, but because for begineers with the PC, I really feel
Meguiars #83 and #80 are phenominal products that are very begineer friendly when used on the Meguiars 8006 or Lake Country White pad.
The speed dial relates to the OPM's, not the RPM's of the machine. I know speed six is 6000 OPM, I believe 5 is around 5200 OPM, and down the scale.