Feedback for the thread. After deleting the rolling cache (recommended by a few on this forum) I gave SteamVR a serious try and had it working to an acceptable level with only a few head turning stutters here and there. The crisp quality of Steam VR is better than OpenXR, but not by much.
I flipped back to OpenXR to compare results and I had the smoothest, crispest flight I’ve ever had - seriously thought I was in my bird. Not completely crisp vs SteamVR but I could make out windows of houses at 2000ft.
I can only theorize that MSFS got “blocked” up with rendering VR or that aggressively changing the settings overwrote everything.
I’ll edit this post to include my render settings later today. But I’m running high on everything except texture resolution which is on Ultra and Occlusion at medium. 90% render scaling with OpenXR at 120%. No stuttering through photogrammetry (I tested with a place called Birmingham in the UK.)
Hope that helps!