I can't really tell you which pads to use on your roatary. It is really user preference. I use 6.5" pads with mine, but I am conmfortable with them.
I would keep the PC. Even though I have a rotary, I still use the PC a lot. Plus, if your rotary goes out of comission, then the PC is there for a back-up.
I have yet to use the
LC CCS pads, but if they are better than their regular pads like people claim, then they are well worth the money.
BTW, Audi's are known to have the hardest paint. I don't think you will have a problem with soft paint.
You should do good with those
Menzerna polishes. Especially with the FP!! and the 106FF.