I am usually not the first person to say someone is too long on draw length, because I believe the majority of people can shooter stronger shots and more consistently using korean style "power triangle" form which requires a longer draw length than what most people use. With that said, your draw length is too long.......[8D]

You need to shorten at first about a full inch, your release elbow is lower than the nocking point on the string. Shortening draw length will help bring this in line. Once you can do this, you need to bottom out that front side shoulder. You can practice this and get to know the feeling of that being bottomed out on a door jam. Once you learn the feeling of that locked down shoulder position in the front it will make your shot MUCH stronger and much more repeatable. Once you can get these two things done, I would like to see your draw length again from the back, above you, and from both sides and I could give you a rough estimate on how much shorter you need to go from there. These two things should help you stand much straighter and once you practice all of these things to the point that they happen subconsiously and without thought, your shooting is going to improve much more drastically. I bet you fatigue quickly after 40-50 arrows..........