Mikey, I'm afraid I lost you...are you thinking you've been applying too much product?
Polishing with a PC is really simple, so don't over think matters. Just apply like a nickel-sized blob (or 4" line) of product and work in with the PC. Genarally beginners use a little too much product. Move the PC about 1" per second and made about 3 passes over each spot. One advantage of that swirlbuster pad is that it is firm, allowing you to apply pressure to the pad - to an extent, the more pressure you apply, the more you are going to get done.
If you are not able to remove as many swirls and scratches as you want, you will have to step up to a more aggressive product first, then go back and finish with the swirlbuster product. For this youcan try
SFX-1, Optimum Compound, or
Menzerna Intensive Polish (the swirl buster pad will be great for these products too).