I want to put these two thoughts out:
- Instructors diagnose things that they believe are crucial or most crucial in shooting well on a level they consider high. They may have different emphases and different focal points. Comparing different instructors might be fruitless. You may have to either buy into one guy's teaching, or sample multiples.
- People can generally concentrate on one thing. You may want head to toe to trigger finger, and they may be telling you just one thing.
With that out, nobody has impressed me as much in that regard as Ben Stoeger in seeing a big picture, a small stuff and things in my shooting that I didn't even notice myself.