I know what you mean.
I've moved to the U.S from England and as you've said, they don't use traction compound there so I've little experience of driving on a traction compound treated track even though I've lived here for over a year!!
I think as what has bean said earlier is right. If your driving on untreated track, then you have to soften the set up considerably !
1.5 to 1.7mm springs depending on track and 50 to 60 Wt oil on 2 hole pistons, maybe even with larger piston holes as per Darren (muppet Racing/ British Champion !!!!)
But with "treated" (very high traction tracks) you can run very stiff set ups. 1.7 to 1.9mm springs and 50 to 80 Wt oil on 2 or even 1 hole pistons as per Motorman and the Phenix G4s Team have been successful in using !
Changing the car set up is part of racing.......get used to it.
My 2 cents worth...........where have I heard that said b4
Motorman...thanks for those parts. Will talk to you soon.