Sasha, you know guys like us are different. Your laying down a lot of hp and braking from 240-250 kph (maybe more) at the end of the back straight. I can understand 300’s not being enough in this case. You have loads of heat to dissipate. Me, I had like 120whp, I can’t get my car going fast enough.
Also, you run HUGE wheels, this is factored into brake torque needed to stop those bastards. You have weight long ways away from the center of your hub.
I can say that none of the guys on this board will be at your level, and half will never be at my level. They have no need for anything bigger than 300’s, yet everyone argues about it.
Adam for example had no need for anything bigger than 300’s, he was running blank rotors and Hawk HT-10’s, and laying 400whp. He didn’t have big wheels and tires though, he only ran 16’s and 245 Hoosiers, and was on Mosport GP once or twice.
Sometimes I do suck 
Andrew.