Personally, I really refuse to work on release. I release the best when I am not thinking about it at all. I just let it happen, and wherever my hand lands after the release it lands. I don't even want to think about that. I will add though, that I need to have the correct amount of back tension to release cleanly. I'd also add that my release hand needs to be relaxed. I try to keep it relaxed through the drawing process however.