@icedquinn
As far as I know, it's universally accepted that you can tell the difference between a 60hz and a 120/144hz screen. So it's nothing wrong with your display. What you're feeling is probably real.
@icedquinn
You sure you've locked your fps at 60?
@icedquinn
If the externals would default to normal vsync, then yes, freesync would probably be the cause. I've always disabled vsync on any game I play, even if I easily exceed 60fps, because it always creates input lag, and I just lock the fps.