Change your rear camber to -1.5 to -1.75. Lower your rear air pressure about 3 psi. Increase your front sway bar size.
Your tires may be heat cycled. They grip good when starting your session. Just when you start getting up to speed and feeling comfortable, about the 15 to 20 minute mark. They start to get greasy. Is this how your sessions go?
The Z has one helll of a camber curve built into the rear suspension.
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