I benchmarked the game a few times Koalifier. The in-game FPS counter seems to be polling less frequently than other FPS counters - even if i use the graph - hiding many microstutters, at least in my case. Got an i9-9900k and RTX 2080 with a 240hz g-sync monitor. I sent you a PM with a video as well. Every other game works flawlessly so the problem is not on my end for sure.
Thanks for the vid, I'll check it out