It’s all true what you say, but the fact is that when I run X-Plane through the SteamVR application, my image is smooth as butter, with SS = 1.7. Running X-Plane without SteamVR (via the Oculus native app) produces the same effect I have in MSFS - a jagged view of the cockpit.
I’ve been using MSFS for a short time and thought there might be a trick to avoid it.