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You have likely heat cycled the rear PSS out. As you heat cycle the tires from autocross or track days, the rubber compound gets harder and harder and grip reduced.
There is a reason why race teams will usually use a fresh set of tires for practice, qualifying and race.
In our Time Attack days each heat cycle hardens the rubber compound enough to add lap times by couple tenth of a second. Having or not having a fresh set of tires for the timed laps usually means winning or losing in our class.
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