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I run cup 2 on mine and start the track day off at 28 psi. This gives me around 35 psi hot. I think what you are experiencing is how much Cup 2 tires suck on the street. You get them to temperature on a track they are great. When they get to hot they lose grip quick. My best times are usually around 5 min into a session. After that they start degrading.
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