Clark seems to assume users will be in a sleeping bag. I think that is nuts unless the bag zips all the way down and is used a an oversized blanket.
@60 last night and with a 15oz 3/4 UQ rated to 15F,I didn't need a blanket at all. You'll find, once you get a bit used to it, that the weather-shield over you stops drafts. I know these hammocks well enough to appreciate that @6 1/2 ft, the previous may not be true, as your head may be a bit higher under the head-end hood than mine is.
Take care of droop with a bit of shock cord between hoods and hammock ends. Or even less shock cord on a prusik, just enough to pull the hoods back so they will keep the netting out of your face and off your body.
I'd be curious to know what your implicit ridgeline length is that you are comfortable with. Have a tape measure with which you could measure and report? Just find the sag your comfortable, then let one of the ends of the hoops out of its keeper so you can measure while you are sitting in the hammock. You should be able to reach with one arm while extending the free end of a 3/4" tape measure out to the other supported by your other hand.