due to your monitor capture and no actual game running or other load, you aren't really pushing your PC that hard IMO. if you have a game and can do a game capture, that would be most helpful. make sure you dont have a game capture and a monitor capture in the same scene when you test this.
Other than that, you never popped much over 0.5% duplicate frames so if you were loading down your system, that is the preset you want. if you were not loading it down and merely just sitting on the desktop, you might end up sticking with med preset.