I had heard that framerate should be capped to 3 frames below the max of the monitor.
Do I then go and disable in game vsync, and manually enable Vertical Sync through Nvidia “Manage 3D settings” on a game by game basis? Is on the one I should use or fast for the Vsync setting through NVIDIA control panel?
Or should I just stick with in game vsync?
This is what I did too! In my case, it was partly because my monitor (Samsung Odyssey G8) had issues with flickering when games had high frame rates (e.g. 2D games and game menus) without the fps cap.