Hi,
Our local club races on carpet, I think its called primatrack GT but I could be wrong.
We don't have many jumps so its mainly flat track. Our set up is limit the shocks to get it slammed to the deck, make it nice an stiff and bang some foams tyres on it. Sort of turn them into touring buggies which might not appeal to everyone but hell they're fast.
I believe its what you chaps across the pond would call "a sweet ride"
Joking aside, I'd start with foams tyres, CRC might be able to give advice on the compounds to start and which additive works best. Then tune the suspension to suit your track.
Best of luck.