TBH the stock disc size is just not big enough and the pad too small too. No matter what you use you will get heat fade until you go the a physically bigger disc and pad combo. I run JCWs and for road use they far out poerform the stock brakes for heat fade and braking capacity. However the
JCW still go into meltdown when really pushed...TBH the only way forward is a BBK if you tend to find your that brutal on brakes.