I am using ATM x86 32bit ksp KSO25 and SS parts and I don't have any problems. of course I updated Firespitter and JSI via the new b9 update. And all seems OK. Edit: I also replaced klockeed martian and the others that are also included with b9.
There is a DRE config in the FX folder so DRE is supported, on the other hand FAR and NEAR are not. use freeman's Space plane MM patch in this thread somewhere, and B9 air brakes, all your over heating problems will be solved.
Well if it all works except the engines, I'll use everything but those, the stock engines will work. Well I tried the fairings and there are spqces between the, they just don't line up right.