The only part I don't understand is my head glued to my left shoulder and the landing part but I understand it a little better.
Once you leave the lip you should snap your head from your right shoulder to your left and keep it there until you have spotted your landing over your left (rear) shoulder. This keeps your body spinning as one part instead of separating upper and lower body. As for the landing once you spot it you will start coming out of the tuck and grab put your board down toe edge first (if you have never done this try it with backside 180s first) It helps a ton.
If you are anywhere near Brooklyn we should work on this on the trampoline. It is an advanced motion that should be learned properly. I know there is no way I can truly explain it on here.GL