Hi ashlydavis 
Welcome to the Flight Simulator Forum.
I am also using RIFT S but with a RTX 3080 Card which is still no way Driver Supported for VR in this SIM by NVIDIA or the SIM developers and your card should perform better than mine currently.
MY CPU is a i9 10900 so thats not so far away from my Hardware then CPU wise.
Which Version did you buy i mean Windows Store or Steam Version?
I do own the Steam Version and there i use the Standard SteamVR and Standard Oculus Settings.
Currently there is a white Flashing inside the SIM BUG with Oculus Beta, so most of us reverted back to non OCULUS BETA Software until this mess is fixed.
Did you first place test with the Standard Default Settings in all Tools or did you directly switch and Tweaked any Tools which may now mess up your Experience?
Can you activate VR Framerates in the SIM ?
What Resolution / Render Scale / Location and Weather Conditions did you test in VR so we could compare?
Screenshots would be good also.
Just saw MouthyGrunt97 added a PDF which you can also test.
But deactivate OCULUS BETA if you get white Flashes and unisnstall and then reinstall the Oculus Software then and keep it offf until it is fixed