Fiddling around and procrastinating too much sends you mad. Look what happened to poor old CaptSopwith. No offence Capt.
Set GPU to default and check aniso, aa and vsync are "application controlled". Then in game, (I) set texture filters high, aa to 8 and force vsync. Works on my rig and others may differ but the point being leave the GPU alone at default and if you must fiddle, fiddle with the in-game settings only.