First off I am an uber noob, so, sorry if this has been covered. I searched and couln't find it.
Can you use a single line suspension with whoopies made into both ends. Then use two continuous loops (on a gathered end type) prusik to the ridge line and larks head to the hammock. This would allow adjustment closer to either tree via sliding both whoopie loops for ground clearance (stumps rocks etc...). Also, the prusiks could be slid to change the hang angle. Pardon my imprecise description, I'm just getting started.