With the recent rash of exploding clutches I'm wary of going with anything less than a stm rage 8. I'm down to running a dalton kit or buying the parts from the xds clutch to make mine a locked unit and run a secondary spring. Where in SC are you located?
We've done a bunch of QSC primaries and STM secondaries on them without a single failure of any kind. Shit happens, but it so rare that you can't concern yourself with it. There is a question on cover clearance on the STM secondary on the 15 XMR that I am waiting to find out the answer for.
we just put a CVTech primary with an EPI silver secondary spring into my buds Mav and hes running 32" MotoMTC's and along with the "sport mode low switch" and his is pretty badazz! We just did 123km ride on the weekend and it worked great