xtrema, I'd really like to see a video of your shot to do justice to the elbow problem. If as you say, your forearm and wrist are relaxed and if you are getting your back to "pull" your arm through the shot, your elbow angle from your full draw position to your follow through position should not change. Your biceps and triceps should also be relaxed. It sounds like you are using your arm muscles to ensure the follow through, rather than relying on your back to do it. Be careful not to reduce your draw too much and loose the alignment of your string forearm and the arrow in the horizontal plane.
Try a few blank bale shots and really concentrate on FULL (wrist/forearm/upper arm) string arm relaxation. As I said, your elbow angle should not change (tighten up) at release.