You haven't mentioned that you have any symptoms of target panic, so until you do, I'll stay away from that.
Bow arm shake could be related to alignment, or lack thereof. I like to shoot left handed from time to time, and my left and right sides aren't as strong when their roles are reversed. My right arm was shaking holding the bow at full draw when I was shooting left handed. I think this is because I was standing a little open to the target, which doesn't give you good bone on bone alignment, so I was having to hold the bow too much with my muscles. When I closed up my stance, so my shoulders were better aligned with the target, the shakes went away.
Then I noticed I was doing the same thing when I shot right handed, but I wasn't shaking because I had evidently gotten used to it. But when I closed up my stance shooting right handed, my accuracy improved, probably because I was holding the bow steadier.