Hi there. My setup is similar-ish to yours - 5950x, 3070 OC, 64Gb @ 3600, 2Tb NVMe, and 850W power supply. I am running 5120x1440 (or something like that) and i was getting 9-12 FPS at KJFK with med to high settings, lods at 200 and 100 with airport traffic at 25-50 settings.
I turned on HAGS (Hardware accelerated gpu scheduling) and that shot up to 30 FPS steady.
I then cranked up the settings to high to (mostly) ultra, leaving lods the same, and setting airport traffic to 50 on all three, and now see 25-30 FPS.
Haven’t installed the new video driver yet, but have had historically worse performance with DX12.
Check your HAGS setting and see if that does anything for you. I had it off as I noticed that was recommended more often but switched it to on just to see. Glad I did.
Best of luck!