I also believe that your DL is a bit too long. And, although not necessarily related to your form, having that nock ring inside the loop isn't allowing the nock end of the arrow to fly "true" (I notice in the pics that your release is straight behind the ring, not behind the nock) This is a great how-to for a better way: http://www.huntingnet.com/forum/tm.aspx?m=2185934

That flying elbow will most likely stay in that position as long as your index finger knuckle is anchored against your ear, unless you really make an effort to pull the elbow down (at least that's what I'm finding as I sit here trying to mimic what you do...) If you're open to suggestions, try turning your wrist so that your fingers are away from your face and shove your thumb underneath your jawbone. I think you'll find that it's almost impossible for the right elbow to be anywhere but aligned with the arrow if you try that.