Funny you asked about the "click" because I found that to be one of the first manifestations of poor form (which always seems to follow over-thinking the shot). It may very well be caused, as is the case for me, by the string rolling off of your fingers - the result of too deep a grip (relative to the first groove in your fingers).
Picture the release originating between your shoulder blades and bring your thumb to the top of your shoulder upon release, that is, straight back.
Again, don't over think it, feel it. "Become the arrow". From what I can describe it, when it's 'clicked' for me, is that the shot begins with a knowing that you are going to hit your target, which you intently look at. Imagine a laser and burn a hole through a spot - that kind of intensity.
Next, feel the ground at your feet and check your posture, touch your shooting hand to the string and without taking your eyes off the target inhale while fluidly bringing the bow naturally up and finding your anchor. "Use the force", cause dang I can't describe it any other way, and "know" when to release. It's crazy.
Now, forget everything you just read and let us know what the everything-comes-together shots feel like to you and what makes it all gel in your universe... Pretty soon some crazy smart archer will see the connection and jot down a one size fits all formula but until then I think you'll find this is a journey between you, your bow and what it is your aiming at/for. Happy trails...