I sometimes shoot with a conscious division between setting the aim and then moving to shot execution. I find myself doing this at times that things are not happening smoothly---at these times I tell myself to move my focus to the shot execution. Your eye/brain will keep the arrow on target if you just trust it to (that is once your aiming system is worked out and you are confident).
At other times my shot is more fluid---reach anchor and set aim and pull through. I find that the fluid shot happens more naturally for me when I am shooting split finger, but I also have moments that it works very well for me 3 under.
I recently put a clicker on one of my bows and the main thing it showed me was that I was overdrawing---once I shortened my draw up I stopped collapsing and my shot sequence was much more solid. I've tried various triggers like feather to nose, clickers, and sears, but much prefer shooting without one. I am however admittedly fickle and could resort back to one at any moment. I know there is benefit to sticking with one system, but for me making small changes keeps my focus fresh.
It is a work in progress, at least for me.