On my rift S, I have SS off in FS and off in Nvidia Control panel. Rendering at 100 in FS.
I leave clouds at high and most other stuff on ultra.
leave everything standard is OTT.
Pixel override at 1.4 in ODT. Anything higher causes problems.
This is the best trade off for me between performance and quality.
16gb, 3070, i7-10700