Well, high-speed breaks out of the landing pattern, IIRC, were a tactic began by the British early in the war to make sure that their six was clear before they began to land, i.e. they weren't being followed by German fighters. Its adoption by U.S. forces is either a carry over of that same tactic, but by this point in the war, and especially for U.S. fighters on Iwo, was probably more of a hot-shot way to bring a formation in to land smartly. I'm a fan of a nice tight formation break over the runway. My squad has done a couple of good 4-ships, but mostly we only can manage 2-ship.