Here's the real scoop from a former scooper. You aren't going to magically acquire a forward leaning shaft by working on the positions in your golf swing. You have to develop the feel for the dynamic pressure lag creates in your right hand trigger finger and learn to move your body in such a way that this pressure is preserved well into the downswing, preferably at impact. The forward leaning shaft is a byproduct of a steady acceleration of the clubhead. Nearly all amateurs explode from the top and create too much speed too soon. That would be like giving the shopping cart a heave in the grocery store. You'd be running after it. That's the way most people, myself included, tend to swing the club. We want distance, we're impatient, or whatever. We don't start slow from the top like tour players do. You want to feel like you are "pushing" the club with a steady, driving force. This is a huge reason that working on rhythm and tempo tend to provide way more results than working on positions, etc. It tends to steady out the acceleration of the club head which works to create forward shaft lean. (It's also why my favorite tour events are the silly season events at "ball strikers courses". Those guys rhythm and tempo is infectious. )
Try this drill with your tour striker. Take your grip and take your right thumb (righty) off the shaft. You want to feel like the only part of your right hand that's controlling the club is the pad of your right index finger. Keep your thumb off and make swings. Take your arm back to parallel (3/4 or so) and swing to a full finish. You have to maintain lag pressure to hit the ball. A few buckets of this drill and it will become second nature.