Looks like the "Go Fast" folks have weighed in...
It's telling, to me, that no one is willing (yet) to chance the "standard" model, multi-compound M5s (new for 2013).
I guess I cant fault you for not being willing to take a chance on equipment that put you in the dirt once already, or nearly so. Dont blame you a bit...
I still need a long wearing tire, so I *may* take the chance. Not decided yet, still mullin' it.
Bob