Agree with alignment. I would like to see pyro data on those tires. If you are just on the outside edge of the tire with dynamic camber loss and no additional static negative camber ... then no kidding.
Still, Cayman is a A/BS car (same as a c5z06) with more adjustability, stock for stock, vs a DS 86-platform.
As in general, the limitation stock is camber.
To get some more useful data, why don't we look at the Nationals results from Stock and STX classes? These cars are prepped to a ruleset with good drivers.
Nationals Results:
https://dk1xgl0d43mu1.cloudfront.net...pdf?1506006338
BS Cayman - 117.293
DS 86 - 119.566
STX 86 - 116.616
The only take away I have from that is a properly prepared 86 can pick up a lot of lateral grip. Apples and Oranges? Maybe. But STX trim isn't crazy, either.