I too run an I9-9900K PC but with a lower end RTX2060 card.
After faffing and tweaking for weeks, what worked best for my Rift-S are these:-
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not being fixated with FPS number. 18FPS is surprisingly smooth enough and may be all you need. Whats important for the VR experience is no stutter, no jelly wobbles and nausea introducing laggy rendering.
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a solid stable cockpit dashboard that doesn’t make you feel like you’re being zapped with a taser every now and then will heighten player confidence and immersiveness no end.
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the Oculus VR is good enough. No need for Windows XMR or SteamVR. Set and run the Oculus debug tool before running Oculus itself.
I set “Pixels Per Display Pixel Override” to 0. Set “Encode Resolution Width” to 1776 or 1661. Set “Encode Bitrate” to 300 or 350.
I also downloaded and use the “Oculus Tray Tool”. I set Default Super Sampling” to 0. Set “Default ASW Mode” to 18Hz. After setting these I go to the “Service & Startup” and click the “Restart Oculus Service” button.
The Oculus Rift-S though not the best, is not far off the top headsets. Resolution may be a little grainier but you can always right click on the mouse to have a quick clearer glance of your display or gauges.
Though the current latest and greatest headset may have higher rez they too give a limited field of view very much like looking at the world through the goggled eye of Stuart the one-eyed minion. We may all crave for a headset like the Varjo with a field of view of a Pimax but no such headset is currently available and even the current crop of unobtainable GPUs are not up to snuff to drive such a headset.
I say stick with the Rift-S for the moment. It may be the best value to tide you over while you save your bullets for a truly worthwhile headset & GPU combo VR upgrade a generation or two hence.