Do you run FS Autostart?
I just found out about this thing on another thread. Freebie, too.
Kind of a big macro, that will allow you to identify all those hidden processes running in background, and selectively shut them down for gameplay, while not actually changing any of your settings. It starts itself, then my TrackIR, then AH in a clean, low-overhead condition.
No promises or anything, but you've got a lot of horsepower. Should be running better. Try this out, and see if it doesn't clear up the mystery conflict that's crashing your system.
I had few problems to begin with...plenty of horsepower, and a typical 47ms ping from New York to Dallas. However, I could see definite improvement when running Autostart.
Good Luck