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+1 on more camber. My tires don't quite look this bad, but the shoulders are toast and the inner is like new (4k miles, 6 track days). I started to get some delamination as well. Part of the problem is it seems these tires like to be warmed up slowly (i.e., ~2 laps before pushing).

Also, a good source over on thelotusforums suggested that Lotus's test driver says 2 bar (29 psi) hot. I agree, this seems low for a heavy car... but the tires are far better behaved at low pressures with less push.

EDIT: I missed that you're running PS4S; I was talking about Sport Cup 2s - just as an FYI. The source I'm referring to at TLF is TheKevlarKid. I've seen a number of his posts with good information, so I went with the lower pressures yesterday afternoon at Sonoma and found a significant improvement in balance.
 
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