The comment about KW is interesting, because just the fact that KW are fitted doesn't mean the car should be instantly amazing. They are adjustable so have to be setup properly, and it takes quite a bit on know how rather than just sticking them on and using them.
A poorly setup KW configuration could feel rubbish.
And the Cups - I think they're the best feeling tyres on the CSL on the road. Yes they're firm and noisey but the whole car is hardcore and noisey - that's why we bought it