I'm doing a little research on how racquet geometry affects my swing. My main racquet is Prestige LM Mid with that signature rectangular/flat Head grip shape. By switching back and forth with other racquets with "square" or "round" handles, I realized that the reason Head grip shape is more comfortable to me, is that it gives extra leverage to keep racquet stable throughout the shot and prevent it from twisting. My other racquets, such as Prestige Tour 600 (338 grams) and Dunlop MW 200G (360 grams) have "square" grip shapes. While more convenient for two handed backhand and serve, I found them more challenging to keep racquet on track, especially on forehand. Extra weight or swing weight does not change much in this regard, LM Mid is still more stable with less effort. Sometimes I play with BLX90 with that round grip shape. Interestingly it does not twist in my hands much, which I think is due to extremely flat shaft/beam with extra wide PWS parts. So, I'm coming to conclusion that for thin beam racquets you've got to have extra leverage from the handle or more rigid flat construction to keep them from twisting. And, if my theory is correct, wide body racquets (24+ mm width) are designed with the same purpose -- to stabilize their "flight path" simply by the geometry of the frame. I would appreciate if someone can confirm or criticize my conclusions. Thanks!