There might be another root cause to the fluctuating fps in VR.
In effect, I’ve discovered what is most likely a bug where FS2020 is sucking up remaining CPU time sometimes and the cure is to either make it stop using a workaround with the mouse cursor, or if this fails, exit/enter VR a certain number of times until it cures itself.
I’ve commented on this here:
[Update 02JAN2021 - Settings for Motion Reprojection]
And I’m giving some more thoughts in this post:
My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR)