Anyone crack a rotor yet? Rotors only have 7 track days on them, granted 4 of those days are at Sebring. Running G-loc R-12 pads. I've never liked cross-drilled rotors, but then again, I've cracked vented rotors too. I was hoping to get some more life out of them, but 80% of the holes have similar cracks. Is that just normal wear? Running too hot?