Hi Inthewind, welcome to TradGang. Lots of worthy questions, for sure!
For a start, I’ll just bite off one of them: hitting your nose with the string. This is something that is always on the verge of happening to all of us, as close as the string passes to one's nose every time we shoot.
The first thing to try is to get your nose out of the path of the string. Twist your head as far as you can in the direction of the target. This not only helps with the string hitting it, but is generally good form. Most people don't have a sufficient range of motion to twist their heads far enough, so as far as you can is good advice. If you happen to be able to twist your head so far that your nose is pointing to the left of the target, then back off until it is pointing at the target.
The second thing is to get good alignment of your shoulders and string forearm. If you’re not quite coming to full draw, such that your string forearm is in alignment with the arrow, then the direction of force can roll the string into your nose. This again is just good form.
If you are using crimped on nocks rather than tied on nocks, the brass nock could be hitting your nose. Even with tied on nocks, there could be something sticking out that hits your nose or face. Sometimes when this happens, I can solve the problem by rotating the whole string 180*, so whatever was hitting my face is pointed in the opposite direction.
You could be hitting your nose or face with your tab. Many people use tabs that are too big, which is bad for accuracy and also tends to cause contact between the face and the tab. It is easier to fit a glove properly than a tab: just get a glove that is a little too snug at first and let your hand stretch it so it fits with use. I use a tab myself, but have learned to trim it so there is no face/tab contact.
You shouldn’t have to cant your bow to avoid hitting your nose with the string. If you’re doing everything else right, you should be able to hold your bow in any position you want.