If you’re using motion smoothing you might want to try to cap FPS to a specific divider +3. This will reduce the judder induced by the reprojection switching between repro states.
You might want to experiment with Nvidia CPL FPS cap but so far I’ve got the best results by using Rivatuner Statistics Server. You can try to experiment with different fps capping methods. I use “back edge sync” on MSFS.