That's the solution. Right now, your racquet tip is pointing away from body (and the elbow is closer to your body than the hand), and you're pulling the elbow toward your body. That's shown in your pic, and it's "incorrect." Instead, have your racquet tip initially pointing slightly toward the body (i.e. hand closer to body than elbow.) When you take your racquet back in that slot, the forearm initially moves away from body. This is shown in the Sampras pic, and it's "correct." In other words, just flip what you're doing. I was trying to convey that with the grey lines. The other lines just represent what the overall takeback path would look like in 3-dimensions. Or, uhm, "3 cheesy dimensions"