I’m on a G2 and 3090. I mostly followed the suggestions in this thread: My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR) - Virtual Reality (VR) / Hardware & Performance - Microsoft Flight Simulator Forums
I also followed settings from YouTube channel named “VR Flight Sim Guy”. I’m mostly solid at 30fps with smooth views.
I think the main trick is using the OpenXR app and setting the main scaling there to 70%. I run 100% in-game.