You don’t mention your CPU and memory, both of which have a lot to do with MSFS VR performance. I have a 2080 Super, i7 9700K running at 4.9 GHz with 32 GB ram, and after much tweaking mine is running very smooth at ~30 FPS. I have a Valve Index & the Steam version of MSFS, and it currently looks great, runs great & almost no stutters.
For me the key to eliminating stutters was making sure Windows HAGS & Game Mode are both OFF, running the SteamVR 1.16.x (beta) branch, and most importantly making sure that MSI Afterburner is not running. After that I just tweaked my FS graphics settings to get my preferred balance of eye candy vs. performance. I have not had to sacrifice a ton in terms of eye candy.
I highly recommend that you check out these threads which were extremely helpful in finding the right overall configuration:
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