Man, I sure hope you get that figured out. I am not at all saying this is the problem, but I'll mention what I had to do on my diy for my daughter. It seemed the same thing happened when we did the gathered end knot style that the Traveler and WBBB use. So I took it apart and hung it like an ENO where the sewn channel is hanging loose on the suspension and it tightens up when you get in it. I wonder if something may have gone wrong with the gathered end? Sounds like it's tight in the middle and loose on outside of the knot, possibly. FWIW, my BB has a superb lay with great support.
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