There is a little well-intended confusion on the Djinn outer trailing edge angles...
Primary purpose is to smooth out reverse (this works in confunction with the bridle).
What causes the wing to flip during reverse flight is wind getting past the trailing edge and on the back of the sail... Having filmed multiple slow motions tests, we found it starts with a small ripple in the outer trailing edge.
Breaking it down, the center trailing edge curves away from the pilot, therefore it’s further away from the “tipping point” than the sail outside the verticals, which doesn’t curve out very much, naturally keeping the outer trailing edge closer to the pilot, and the tipping point for bow tie.
The wind pass-through when resting on a 45 is an added bonus, but was not part of the original purpose.