Hi Bille, My idea comes from Flysurfer’s Speed4DLX and F-One’s Diablo1 kites. The Speed4 uses 3 span rows with a single pulley mixer. The Diablo uses a “Turbo” line so mid-sheeting C=Z. This mixer reverses the idea so Z=C mid-sheeting.
My goal was to match the low AR 12m Genesis with a low AR HF Surf wing. Original setup turns/reacts too slow, tried a pulley bar and that was ok but awkward. Then last year pulled it out again and tried the Jackovmixer which was another improvement. I think this 2:1 mixer works even better.
I tried adding a little camber by adjusting B-Mains from 8" to 8.5", turns slower, slower depower feel, but smoother. At 8" B-Main the kite has a quicker depower & turn feel. If trying this mod test a few B-Main lengths to find the sweet spot you like...