Hi All, first post here!,   
I've been reading all the FPS and VR improvements / Settings and Nvidia settings, they all point to mostly the same thing. ( Razor cortex/Nvidia max performance settings/turn off game MSAA etc etc )   
However, by chance I came across a combination of settings that made a huge difference for me anyway.   
 1, I used oculusTrayTool to set  super sampling to 1.5 or 2.0 ( remember to restart the oculus service after )    
2, Within DCS I set the VR Pixel Density all the way to left to 0.5 
   
I can still read the cockpits very clearly, and now seem to get a very decent FPS improvement. additionally when I hit the flyby view in VR I'm not seeing the rubber banding/ghosting anywhere near as bad as before the settings above.