You're all over the place. This is because you're looking in the mirror and your visual reference point is constantly moving. You need to pick a spot 6 to 8 feet in front of you on the floor. If there's a wall or mirror there, pretend. I used to bring a black sheet attached to suction cups to put in front of inconveniently placed cages like the one you're using. Your neck/ head should be neutral or you'll kill your hip drive which is another thing you're doing by keeping head up. Fixing your eye gaze will help tremendously. Get some lifting shoes.