Medzu: I agree with you. There are no problems without GFE. But, GFE optimizes the game very well, the shadows are not like 4 black pixels, they are smooth and even. The blurring of the picture also disappears.
the default "Image Sharpening" setting in NCP works wonders with almost all games.
and i've had no issue with bad shadow resolutions or pixellation in the game.
there is no setting that GeForce Experience can enable that isn't available to you manually through the Nvidia Control Panel or in-game settings, GeForce Experience just loads pre-configured settings that members of their team have implemented.
you would have to research yourself, but NCP settings may even override GFE settings.
so if GFE is in fact disabling v-sync, enabling it in NCP may still override that.