Dwight, the back (innermost) connection point for the front and the forward (innermost) connection for the rear will give the most angle of attack change. Basically, the closer the line attachments, the more depower control available.
The further forward the rear attachment is moved also increases turning for the ARC kite, and may for the blimp, too. In effect, the attachment point being moved up gets closer to the CG of the kite - so the "moment arm" being the same length for the same amount of bar movement has greater effect on the kite. Imagine a flagpole. If you pull the flagpole 12" at the top, the pole barely bends...but if you pull it 12" at 2/3 up the pole, you will see a noticeable difference in the pole being bent.
BTW, the ARC community has known about this for years, and for those kites, the rear attachment point can be brought forward up to 1/3 the spar distance (tested) with good results. The front attachment being moved back, however, may slow turning down to cancel the rear being moved forward at some point. Maybe a blimp rider will test the rear attachment point for blimps to see the benefits/drawbacks? Typically, ARCs will experience hot nails being driven through their webbing for more line attachment points to test LOL!
(then again, the foils are a lot easier to cut and sew back up...)