I think I've been the victim of overdoing the "hold the angle of the wrist cock for as long as possible" thought in the downswing. Many of the books I've read emphasize that idea, but can't it be overdone? If you hold it till your hands are hip high on the downswing, you've now got less distance and time to let the clubhead speed up so it's square at the ball. Jack Nicklaus has said "let the angle release all the way from the top as long as you transfer your weight to your left side." Look at slow motion swings of Nicklaus and Snead in particular. They look like they are releasing from the moment they swing down, not holding that angle. I think I've been holding myself back for a long time with the delayed release.