On last race last weekend on black carpet I have big problem with grip. There was colder and I was sliding around. I go to thinner oil and softer springs and nothing helps. I try to switch upper rear arm bushing to have longer upper arm. At finals it was better, but I think that there were higher temperature, but the car has slow corner speed(maybe because it was soft?). Do you have any advices, what to do on lower grip, to have rear end of car more 'locked in'? Thanks