I didn't even think about the Day/Night switch since mines Auto Dimming. If you grind more radius to the side closest to the windshield it gives you plenty of clearance. And mine had the allen socket screws so tightening it wasn't an issue. Did you screw the ball base stud all the way in after you re-mounted the mirror? I have noticed mine doesn't bounce around any running down the road.. but sitting at a light with the stereo cranked.. the bass canon in the trunk actually "bounces" it where it's laid against the bottom of the mirror.. LOL.