Caliper Rebuild would be one guess if you feel there are piston issues. When was the last time you rebuild them, heat destroys the seals quickly and dust and debris can get into the piston area though I don't recall anyone ever reporting problems even with pretty destroyed seals. XP20/12 is considerably higher then most people use but I don't think that's an issue. Also what are your tire temps afterwards if you have that?
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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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