You can try further mitigating, if not curing, most of the stutters not only in disabling motion smoothing of any sort (saving fps and saving visuals from wobbling), but also in using known working drivers and settings.
You might want to read this to know more about this:
My 2070 SUPER VR settings and suggestions (Index - SteamVR)
Read the NVidia Setting chapter for more details:
I’d recommend you use NVidia Driver 457.30 for VR (and 2D actually) with a 20XX and 30XX *.
Read the SteamVR Extras chapter for more details:
after trying I do find it is actually greatly reducing stuttering
You might want to read this as well for WMR and the G2:
My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR)