I am posting to the original question...so forgive me if it's repeating another thread comment. Up until recently, I've had a hard time with the shoulders rotating too aggressively in the beginning of the downswing - result...hook/draw and most recetly a push. What has worked tremendously well for me is to feel as though my shoulders (righty) are held in the fully rotated position for as long as possible during the downswing. My sequence is:
(from top of BS)
1. keep hands passive but "alive"
2. lateral shift with lower body toward target (just enough to shift weight)
- at the same time, let your hands drop straight down. The lateral shift makes this move natural and effortless. Your arms can do this while your shoulders are fully rotated.
3. Once you feel the weight is shifted, rotate the hips toward the target. Your left shoulder will start moving out of your peripheral vision to the left, but resist the urge to "release them". In fact, the shoulders shouldn't "release" until at or slightly after impact to aid in a good follow-thru Your hands continue their inside approach to the ball all the while...
4. The club is square so long as you keep your shoulders as stationary as possible. Again, they'll be rotating, but you want to try and keep them stationary...this produces good leverage and the grounded effect in your feet.
5. At impact, you should feel a stretch along the lower left adominal area and also in the left upper leg area (quad). If you don't feel this, you may have made too large a lateral shift initially. The stretch is dubbed "hitting into a firm left side" or "hitting against the wall". It's crucial that your hips not shift too much toward the target prior to rotation, for if you do you're deminishing the power and leverage all the other positions in the sequence strived for.
Keeping the shoulders as stationary as possible during the downswing causes your left shoulder to rise almost straight upward and then eventually toward the left and keeps your head behind the ball.
hope this helps!