Mathematically, it can work at 11.5' and I've got it set up out there at that length now but am dragging the ground (the UQ is), probably because I did not account for the weight of the tarp. I've run out of whoopie take-up and will attach the hammock directly to carabiner B ...
But that will have to wait until after supper!
It's after supper and company has gone home -- I doubled up one whoopie and got the clearance needed.
Test results tomorrow, okay?