Here is my last autocross on PSS tires. This is the only clean run I was able to get in. My other runs I was getting a lot of wheel spin and drifting as I apply throttle.
You will notice that most of the time I am coasting on partial throttle. The times I get on the throttle, the rear end wants to kick out. At the final left hand corner exit, the rear end kicks out when I apply throttle and I have to counter steer to correct. This is in completely dry conditions in sunny 60 degree weather.