275 is fine on the fronts. Lots of guys run a 275 square with Rays Sports on track.
Try a set of Kuhmo V720's and keep pressure between 32 and 34 psi. Some guys had issues with delamination, but they wore perfectly all day at Sebring. They're hundreds less as well.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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