Best for me (setup 5800x + 2070 (not super) + FS Steam version + Reverb G2) now is the latest Nvidia Driver and using SteamXR (not WMR). I got 34 fps with 100% render scale (in steam and fs2020) and a mix of high / medium settings.
Second best was Nvidia 457.30 and WMR-XR.
The 457.30 did not work with steamXR and the latest did not work with WMR-XR