Well, I've tried much of the suggestions on this thread.
vrperf toolkit didn't really do that much (just dropping the files in the BIN directory? that's it?)
Lowering the resolution per eye made the biggest difference, and I could get up to 60-65 fps, but it's a tradeoff.
So far, looking around the in the headset is very smooth, but when I turn the plane with the controls, it just feels really choppy, even if it's at 50 FPS. Then the motion sickness kicks in, and I can only last about 20 minutes.
While the immersion is really amazing.....I think I'll wait for a more optimized version of DCS before I go down the VR route. Perhaps my experience would be better with a beefier video card. Prices are trending down, so that is a plus.
I think overall, I think I get more enjoyment for now with track IR, and a keyboard. I have issues with my HOTAS, and not everything gets mapped properly or works as expected, so I still rely on the keyboard for some things. I just feel I have more control of things.
The thing with this game is it is so customizable with different equipment and settings, and some people really dig that and have the time to work everything out. I am more of a plug and play time of guy. I get jealous when I see those great cockpit setups people can build, but I can't put in hundreds of hours to get there
Once this game is optimized for VR, and the motion sickness works it's way out, then I think I can get back into it.