Currently it is held together with safety pins. Now that I've had one great night, no leaks above the expected ones for the mask, no waking me up to adjust, etc., AHI under 1.0, I will sew it along where the safety pins are now.
Changing the angle of that lower strap really made a huge difference for me! It now aims more downward, and comes from around my temples. Hope the photos are clear. I encourage anybody who is having trouble with their Swift leaking to test this--all you need is four safety pins to try it out!

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