dude if you have random fps stutters between 200 and 300, that is totally irritating. constant 100 or constant 200 is way better than sudden drops from 300 to 200 all the time. I have the same problem rn, fps stuttering between 240-150 fps... was constant 220-240 before feels worse than 60hz vsync. dont talk about it if you dont notice that shit.
I think it has to something to do with the sound processing, try turning of HRTF and positional VOIP