I just attended Rod Jenkins's seminar in Hood River, Oregon, and he addressed both of these issues.
Don't worry about the high elbow when looking at the arrow from a side view. A high elbow actually helps develop good back tension. The problem with a high elbow is if you're using split fingers, your index finger may be pressing down on the arrow nock, which could cause it to rebound on release. If you're using 3 under, this won't happen. I presume there are ways to keep it from happening if you're using split fingers also, but since I use 3 under, I haven't bothered to find them out.
On the other hand, you should definitely worry about coming to full draw, and good back tension. At full draw, your drawing forearm should be in line with the arrow, viewed from the above. If it's not in line using your normal anchor, you may need to move the anchor back some. For example, you may need to move your anchor from index finger in the corner of your mouth to thumb hooked behind your jaw bone.
The main emphasis of the class was developing good back tension and a subconscious (surprise) release. When you have achieved this, your drawing hand should move backwards after releasing the arrow, not to the side.
Out of a dozen or so experienced archers in the class, none of us were really maximizing our back tension, until we went through the drills with Rod, including use of the Formaster.
Some of us didn't have a problem with the subconscious release, but about half of the class did, and had to work on increasing their back tension, by drawing their shoulder blades together, to initiate the surprise release. The key is to never stop pulling the bow until the arrow is released. You can still be pulling the bow when the arrow is no longer being drawn backwards (your pull backwards equals the pull of the bow forward), in order to allow you time to pause before your shot, but there should never be a collapse of back tension, such that the arrow creeps forward at full draw.
Rod discusses this in MBB III, which I recommend to you, but seeing it on video is not as real as being shown that you are not doing something you think you're doing in person.