Ket,
I sincerely hope Asrock takes you up on your offer. It seems to me that the Extreme6 has more bugs/issues than the Extreme4.

I'm still at a 45x multi wall. Still get double-boot problem with PLL Overvoltage enabled. I'm very intrigued by Radier's ~5ghz settings, but they just cause a black screen with blinking cursor on my end...