The in-sim Vsync is rather trashy, I have never used it. Good move.
So if 30 FPS is your preferred target, you can limit FPS to 30 in NVCP and then set V-Sync to Fast, and confirm the monitor’s refresh rate is set to 60, and then let me know what happens.
Playing on PC is not plug-and-play, it’s quite an endless circle of chasing those elusive frames.
He got it right: