I'm having a little trouble picturing the tight ridgeline with the really sagging hammock. I don't recall that much stretch with mine. You have any pictures? I wonder if it has to do with the angle of the hang.
I was considering a stand like that, so I'm quite interested now in seeing what it would look like.
FTW, the Blackbird has a ridgeline that's an inch longer than a ULB but nine inches shorter than the Explorer - the Hennessy models are all different. The size difference in a BB is in the width - it's definitely larger than the largest HH.