I think you guys have the depower wrong. With "X", you get more depower, but don't have to move the bar as much. From the figure, you can see the AOA changes greater than 7degrees more with the same movement of the bar with a more-forward rear attachment:
You should also get faster turning, since the moment arm is connected closer to the kite's CG, so there will be more force on the kite at turning. With the figure, a similar situation occurs, except instead of AOA, you are affecting the force on the CG of the kite. Moving the attachment point forward for the rears should give faster turning.
Anyone have any comments? I only rode the 17m fuel with one setup so far, but with every other kite I've had, this has been the case. I don't see why it will be any different with the SS2003.