Dani - Here's a couple of DA tips that might be useful...
The DA speed you use depends upon what you are trying to accomplish.
While an increase in pressure is necessary, it is not the only factor that should be addressed.
Proper priming of the pad is super important!
This one step will have more positive effect on polishing performance than anything else. A clean pad is equally important.
The pad should be rotating at all times. More speed is a good thing when heavy defect removal is the goal. This does not mean that slow rotation will not work. However - some pads rotate well while others do not. Oftentimes, if there is insufficient removal of defects even with a substantial amount of downward pressure, a swap of the pad to one that is more aggressive or smaller in diameter will work. The guys that are using smaller diameter pads to remove heavy defects are working smart- not hard.
After all of the defects have been satisfactorily removed, final polishing should be accomplished using the softest or mildest pad available.
For final polishing, prime the finishing pad as previously discussed, and let the pad sit for a few minutes. This will allow the buffing liquid some time to permeate the pore structure of the pad. Then, polish at a slow DA speed setting, making certain that the pad is able to rotate. It does not matter how many rotations there are, the goal is to minimize the chance of "flatspotting" the pad. Add small amounts of product as needed.
If some marring persists, super-clean the pad or replace it, re-prime, and then remove as much product as you can. There will still be some fresh and moist buffing liquid attached to the pad. Use a very slow speed setting, use constant pressure, and DO NOT lighten up at the end of the cycle.
SHORT VERSION:
Prime the pad with product before use to saturate the pad.
Use dime sized amounts of product on the pad for polishing.
Always apply med/heavy pressure depending on cut desired.
Use a soft pad, mild polish and slower speed to do finishing.
Do NOT lighten up on pressure to finish. Slow the DA speed.