ml,
You have a lot of really good things going for you. A lot of the basics are good. Try to maintain them as you work on what I suggest below.
I do now see what you are talking about. When you raise the bow to draw, you are also lifting your shoulders (both of them like a shrug). What you want to do is lift the bow arm and string arm but keep the shoulders down in a relaxed position. Right now, you look like you are trying to cover your ears (to warm them) with your shoulders.
Try this. Before your lift to draw, lift your shoulders as though you were shrugging. Then let them relax down to a natural relaxed position. NOW!! KEEP them there!! Lift the hands with arms/deltoids only -- BUT KEEP THE SHOULDERS DOWN!! This will also be easier if you can keep your head up more -- don't bend your head over and down so much. It should be straight up on top of your spine.
Your description of the raising bow arm is correct and is caused by the very high shoulders you end up with as you start to draw. It puts your bow arm shoulder socket in a weak position and when you release, the ONLY thing your bow arm can do is move down.
Until you "get" this, stand tall, head up with shoulders down and make the shot (this will probably increase your draw length too) . Once you start to feel comfortable with this(month or two!), then will be the time to experiment with a "hunting crouch" but not yet.
Arne