I, for one, don’t use motion reprojection in the sim, Oculus debug tool, OTT, OpenXR Toolkit or anywhere. I don’t like the blurry, tearing effect it causes.
I run smooth with most aircraft using a Quest 2, TAA 100 OXR 90, settings mostly high/ultra with a i9-9900k OC 5.0GHz and a 3080Ti. Frames limited to 45 with the Oculus Debug Tool (no ASW!). This is running my Quest 2 at 72Hz native resolution (slider full right).
Smooth doesn’t mean high framerates (for me, anyway). It means no stuttering when I move my head to look around and no stutters when the aircraft is moving past objects. Things are not as smooth depending on the aircraft and airport - Fenix gives me some stuttery-ness at KATL, for example.
Oh, and this is smooth while on VATSIM with StreamLabs running in the background. Here’s a video of my settings. Works for me. Maybe use it as a starting point and go from there? Note - this is for a Quest 2, but the MSFS and OXR Toolkit settings may apply -