[lagster]

I have the same problem although I take it back on or under plane and further drop it. Monitoring #3 pressure point at the top of the swing, per Matt's suggestion has helped significantly. If you drop it behind, you immediately lose the pressure. Try slowing down at the top as well as swinging with your back to a wall. Slowing down while monitoring #3 has helped me the most. If anyone else has a suggestion, I will be writing them down as well.

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Sometimes people that get the shaft way off plane at the top(cross-the-line) will drop it UNDER coming down.

However, even with this, just trying to change your ball flight can often help. Go to the right side of the range, and try to hit a left-to-right ball flight for a while. After you can do this, tone it down to a slight fade, then a straight ball. Stay away from right-to-left ball flight for a time.