I too am trying to get things setup / configured for optimal VR.
Right now, I am running a 2080TI and an AMD 3800X + Vive Pro. About 10% off the metrics off, I assume, the king of the hill for DCS which would be an i9 9900K (correct me if I am wrong).
All of this runs on a Samsung SSD.
Shaders installed, medium settings. Running at 1.5 resolution via Steam VR. (PD in DCS is set to 1).
I am still playing around with it - but in an F16 on the CCIP training mission, I get a pretty steady 45fps with the rare stutter. It will go up to 90fps.
On the supercarrier case I mission, I was struggling to keep 35fps. All according to fpsvr.
Strangely, fpsvr shows the video card doing just fine, and the CPU in all orange. (Which I understand is not good).
Anyone have thoughts or comments on what area I might want to examine next?