Mainly F/A-18 at the moment, I have the F-16 but its not in a state yet where I'd like to be flying it day to day. (Which is a shame!)
mild clock on the CPU, but seemingly DCS puts very little load on it (Approx 30%). (I can easily tell as the CPU fan is pretty much idle) Running PRIME I can hear the entire system wind up in seconds.
GPU is running approx 70%
However, just some minor tweaking as you sugested has measurably improved things! I had left the SteamVR settings pretty much stock, so adjusted those as below. I also turned off Ansitrophic Filtering within DCS and wound the PD down.
Now running much better framerate, most shimmer has gone, and everything looks that bit nicer! I still get the tearing (Really only a major issue when looking at an external flyby), but I am no longer taking massive frame rate loses on PersianGulf. (Which ran fine with my CV1)
Textures are a tiny bit washed out, so will play with them later if needed.
Running DCS PD @ 1.0
Suggested Steam VR Custom Res is 130%
SteamVR App Super Sampling is 130%
DCS MSA is x2
Refresh set at 80hz for the moment
Are you running motion smoothing? I currently have it enabled.
Your help was most appreciated, I can now start enjoying my Index against of fighting it!