You'll accomplish a LOT by shortening up that release so that your index finger lays about halfway over the trigger. You reached out for it and looked like you just barely got the last digit of your finger on it, and then punched it (a better visual may be thinking about it like pulling a trigger).

Your hand should not be hunched up after shortening the release; rather, it should be straight and in line with your forearm all the way back to the bend in your elbow. Think of your trigger finger as remaining static; in other words, you're going to actually try NOT to move it at all. You want it to be a stationary force which triggers the release AS YOU PULL YOUR HAND BACK INTO THE RELEASE. You'll accomplish that by squeezing your shoulder muscles together -- which is why it's important to not be overdrawn (too long a draw length). If your draw length is too long, it's pretty hard to use back tension to pull your hand into the release properly.

I'd say start there. If you learn how to trigger your release properly, that's 90% of the battle.