Nothing to add experience wise mate but most of the guys I know with aftermarket systems on their GT3's/2's etc have KW's - they are very good but like you said, if you are trying to optimise it solely for track use, it could be worth the upgrade.
And if that's the case, Meister R GT1's could also be an option ?
(these are the ones I want OR KW's, although I believe it can be adjusted to suit needs, fast road, light track use for me)
Also just checking through some details a mate said that the Clubsport kits are a heavy duty anodised finish, and the competition race kits are galvanised. (CS not really designed to be used in salty conditions)
So do speak to KW if you go that route, as the CS may have or not been updated now as that info was from a few years ago.