You don't have to wrap the treehuggers around twice. If you wrap them
around once, put the ends together, and string the hammock support
through the hugger loops. Then loop it around and string it through
again. This will allow you to start the figure 8. I did this last
night on a smooth-bark tree and it worked fine.
Also, you can wrap it around "almost twice" where there's a big space
between the hugger loops. Just run the rope between them, wrap the
free end once around the standing end, and you'll be able to do the
figure 8 again.
Or check out Ray Garlington's hugger knots at http://www.garlington.biz