Perhaps I'm wrong but there seems to be some sort of check on wicked wheel activation. I've been in several parties where wicked wheels were happening and well that was that. But then I also noticed on my group that actually downed Garuda EX that NO Wicked Wheels occured ever. So I concluded somewhere along the way that its either a DPS check on an add, or the stack on the adds needs to before a certain amount before friction finishes. If im wrong in all those regards, I can at least confirm from my own experience there is a way to avoid the wicked wheels altogether and considering the staggering damage they do, it makes it seems much more like a gimmick that should be avoided then damage intended to occur during the fight.