Track day tire decision

[GTP]

I just got back from a weekend at Gingerman. I now am on GT500cftp front springs with PP1 rear springs. -2.5 rear camber. Hot pressures around 34psi. Experimenting with front camber based on tire temps. Ran -3.4 with near even tire temps. Aiming for inside temp at least 10deg higher than outside.

After 3.5 track days on 315 Cup2s the shallow outer groove is gone and the outside shoulder sipes are gone on one tire. Square setup and i keep a log and rotate every track weekend. So far so good. Hoping for 8 track days per set.

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[allfivefifty]

I remember Michelin using different types of (3 different) tire compound on some of their tires. Are the Cup 2 homogenous in tire compound? Not sure how it will affect the parameters if the outer shoulder compound is different vs middle vs inner.