About 20 years ago I found that I was under pulling with my index finger and over pulling with my ring finger. I cannot hold my thumb down with my index finger like Schulz, but I do curl in the thumb and pinkie, more like Hill. Jerry Hill said that Howard told him that the ring finger is the trigger. This can all get overly complicated. What I had to do, was to go back to what John said, the bow hand rises slightly faster than the drawing hand. This get the pull inline with the power line and gives a bit of a flat draw that helps with the aiming. Some people get into a state where they are hauling the the string up hill. What does have to do with the drawing fingers? It keeps the shoulder and draw arm level. Instead of thinking about a deep hook feeling, try going for a feeling that your drawing fingers are an equally balanced block of fingers that are straight inline with wrist and arm which is in a horizontal straight line with the arrow at full draw. It is easy to find that balanced block, over pull with the index and then the ring finger, when they are equal you will feel it. Some say John has a soft release, he has a short reaction to a very hard release.