The one thing I can tell you that I learned from Mark Baker was forward spine tilt, and I wouldn't describe it as "bending forward at the line" since you should have your tilt locked in well before you get to the line. Basically for me I tilt forward by my third step (5 step approach) and MAINTAIN that exact spine tilt throughout the rest of the approach and release - meaning no standing up straightening out my legs at the end and/or popping up like a jack-in-the box at the foul line.
Fortunately the day he taught me this he had just done a lesson with Bill O'Neill and had some video handy (we have similar physical builds) and he showed me side video of both of us side by side and frame by frame and it suddenly clicked (I'd like to think he used video of me to teach Bill in his next lesson but I'm not that delusional). One thing he noted that was different between us was that my hips and shoulders and tilt did not stay level throughout the approach and there was constant movement, in Bill's case once that was "locked" in it stayed "locked" in until the ball was well down the lane - he mentioned something about the less moving parts the better. Also Bill had much more tilt than I did.
Not sure if this helps at all, and I'm sure somebody like Rob can come along and explain it much better than me - I can just say having the visual made all the difference in the world to me.
PS Since I only see Mark for a lesson every once in a blue moon I did once try a local coach who was definitely old school but was available and a mere fraction of the price of a lesson with Mark Baker - he taught a more traditional style and most of what he "taught" me was completely contradictory to what Mark (and Rob) teach
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