rear grip or lack of it :-(

[Carlos717]

hi all. I'm abit of a novice on the tc front and in need of some help please. I race a tc on polished wooden floor at my local club. I know it's abit oldschool but is great fun and produces close racing. my problem is lack of rear grip. my car seems to brake away in a big way at the rear when applying the power tried a few things but can't seem to improve it. any help would be hugely appreciated :-) thanks for your time.