It is more prone the faster one goes or amount of power applied. I seen recently a 12 sec car had wnet threw 2 sets of leafs bent by his caltracs. he switched to the assissin bars cuz of it. Even i was shocked by that.
I'll file it under believe it when I see it. Too many variables also, how do we know something wasn't wrong in the car? Easy to go 12's even with an unsorted combo