Re: Polish then Klasse? overkill?
SRP has a little bit of cut, so if you have some very light marring, it might do to remove it. Otherwise, I don't see any use for it if you're going to use KAIO as well - both will clean the paint, and the fillers that SRP leaves will just be removed by KAIO. I'd also go for KAIO because you're using KSG - the two products would probably work together better (as you'd expect, them being from the same manufacturer).