“Losing height in backswing”

All I got is focus on what your shoulders and head are doing. When I swing a 5 or 6 iron, if I don't keep my head still and pivot my shoulders around my head, I never hit the ball square.

Put all of your change in your left pocket.

Sounds like the ball is far away from you. Have you tinkered with simply moving closer to the ball? Typically, when I start dipping towards the ball, it's because my body is telling me that I have to do that in order to reach it.

sometimes before I start playing I like to simply stand up straight with the club in hand and rotate my upper body while swinging the club just like you would a normal swing, only standing upright, and then eventually tilt the spine into my stance and keep that same motion.

Without a club, stand in front of a wall, head lightly touching it. Cross your arms, make a turn back and to just past impact keeping light contact with the wall. Just after impact your head should begin to come away from the wall. At no point should your head crash into the wall