I propose that a flat/square beam racquet, because of it's poor aerodynamic characteristics, is stabilized by the drag as it passes through the air. The racquet head is more stable on off center hits, because essentially it's polar moment of inertia is higher than if it had an aero design. The faster the swing, the more stable the racquet.
I just think that things should work the way I expect them to.
Pure Storm GT primarily