Trust your subconscious mind to release the arrow when it's ready. If your subconscious mind needs a little help, slowly increase your back tension at full draw, and hopefully at some point your subconscious mind will start cooperating.
I've been in classes where 19 out of 20 students seem to have a pretty good subconscious release, and 1 person seems to have a hard time releasing the arrow without consciously letting go with the fingers. The instructor works with them, and eventualy their subconscious release starts to work, or maybe they just get tired of being pestered and fake it, I don't know. But if you can develop a subconscious release that will go off without you consciously letting go with your fingers, you will shoot much better, I do know that.