I've been trying to solve my (still very bad) flipping problem and I think one thing in particular may be helping me. I think a major cause of my flipping is that I wasn't dropping my right shoulder on the downswing enough. If your right shoulder is not low enough then you can't reach the ball with a flat left wrist and arched back right wrist so you are forced to "let it go" just in order to reach the ball. I believe by dropping my right shoulder more I am now forced to not flip since otherwise I'll hit way behind the ball. Does that sound about right?