I really didn't comment on the draw length since everyone is different. I also hunch a bit. I have a hard time standing up straight and shooting. You'll know you have it right when evreything lines up correctly and easily.

One thing I forgot to mention yesterday is your bow hand. Watch it. You start off with a loose grip, and then right at the point of release, you grap the bow. If it works, great, but at least try this. Shoot as you normally would and try to memorize the amount of pressure you are putting on the grip after the shot. Then transfer this to the entire shoot sequence. Try to keep the pressure consistant throughout the shot instead of changing it during the shot.