Steam Game vs Non Steam MSFS 5800X3D vs 7900X3D 4090s Pico 4 Virtual Desktop

I run 5800X3D and 4090, Virtual Desktop, and get visibly fuzzier images and SSW / Motion reprojection artifacts in VR.
My brother runs a 7900X3D and the rest is identical 4090 network, settings and in-game settings TAA or DLSS Quality etc…spent hours comparing. But! This is the difference. His copy of MSFS 2020 is a native Steam install and my copy is Game Pass. I do NOT get the option to launch game from Virtual Desktop or SteamVR library as it doesn’t show up.
It works, but I’m unable to get the same sharpness or smoothness as my brother on a 7900X3D. Iv’e attached a video, i hope, that shows MR artifacts while rocking my wings. My Reverb G2 had no such issues. I have tried unloading CPU and GPU in case of bottlenecks etc and it make no difference. in SteamVR 3120x3120 100% to 400% I see improvement but nowhere near what my brother sees in his Pico 4.
Can there be a functional difference in how SteamVR picks up and handles a Non steam game vs Steam Natively installed game.
Something is broke. We meticulously copied settings in all applications and in game and there is a visible difference.
If you’ve ran both copies of the game, steam bought, and Xbox/MS bought, in VR on top hardware, I’d like to speak with you.
Best Regards,
SprungNickel.

I never really solved the SSW artifacts but ended up switching things around with SteamVR at 3120x3120 per eye and toolkit running at 4700x4700 override with Pico 4 at 72 Hz and Virtual Desktop at HEVC and 150mbps, no SSW. Net is a smooth image 80% of the time. Still not happy with my setup sadly. Pico 4 is great. SteamVR is a resource hog and spikes crushes the cores and hurt the game performance to the point you get stutters. Bizarrely enough, even running my set-up in game on low end doesn’t seem to impact how Well SteamVR destroys the experience. I miss WMR… never thought I’d say that, but WMR and openXR is so much more efficient!