I've found some really fantastic settings but I can't explain why or how it works. My setup:
Thanks for the heads-up... really wanting to get EDO working to the point that it's playable. Checking each patch as it comes out, still not there yet, though patch 8 seems to be a big leap (though I haven't tested in-station performance, poor enough prior to that to try that far).
I'm running an RTX 3080, i9 11900F, 32GB RAM, and HP Reverb G1 (running at 60Hz).
The custom render scale doesn't line up exactly with the G1 - the resolution on the G2 at 20% is higher than the G1, but I tried it both on the equivalent resolution settings as you tried, as well as the lowest slider position (20%).
Tried the obove settings on EDH (had uninstalled EDO) last night, and noticed a bit less visual quality, though no discernable difference in frame rate. That could simply be that EDH run perfectly smoothly on my settings anyway.
Reinstalled Odyssey overnight to test these settings this morning. Quality was noticeably, but not too much, worse that with my previous settings. Frame rate seemed the same - that is, no reprojecting kicking in unless things are moving fast in the SRV - same as with my default settings.
Will play around a bit more tonight and see if I can replicate your performance improvements.