Whats causing spin out?

[Where's my car?]

front tires like 65% tread Yokohama's ypk520 i think, rear perelli's 265 about 15- 20 % tread left. tire pressure front 50 psi max, i was running about 43, rear was 51 psi max, and was running about 45 psi

Stock camber to my favor, road was on the California Speedway Track a bit of scraps on the floors. I didn't hit any bumps
the spin occured about half way through the turn. I did let off the accelerator pretty quickly and hit the breaks.

Traction control was on, and i did turn pretty hard.

Upon correcting my turn, i let go of the gas slightly hit the breaks and tried to correct the steering only to lose control.

Thanks for all your advice people!!