Hey man. I have the same problem. Took a lesson from a local AI. He told me that my wrist was double cocked. Check the chapter in the book about wrists positions. You MUST have a flat left wrist and a LEVEL BENT right wrist. No cocking of the right wrist. Drills in the chapter with the hands open, then with fingers closed, and then with the club horizontal. After that move to the inclined plane. You'll get it.
It was amazing to me how "quiet" my hand action felt going through the process. It will feel like you aren't using your hands/wrists at all and your swing will be shorter. but you will really compress the ball once you get the flat left and bent level right. MAKE SURE THAT YOUR RIGHT WRIST IS LEVEL. I was told that when your wrists are level and arms out in front of you, the fingers will be angled some what towards the ground. Be sure that you don't cock the right wrist. This will get you across the line.
Make sure that your club is on plane half way back. the club should either point to the plane line or be parallel to it. You are either on plane or off plane. period.
This is what I was told. Worked for me. You just have to work at it until you can trust it. I'm not there yet, but with the correct concept you can get there.
Please note this not original thought here. Just what I was told at my lesson.
Good luck dude.