If your using it with a SS you can tuck the ends into the SS ends and then bungee cord it to the hooks with the SS. There's a video on the Hennessy site for setting it up http://www.hennessyhammock.com/7instovercvr.html
It tucks into the SS and really closes off the hammock tightly. With the SS on you can hear the air bellows in and out of the hammack through the head hole. And yes, you'll get condensation in there but it drys quickly.
I'm using mine with a JRB underquilt so the mods I made were for use with that set up also. I think if I'd have kept using it with a SS I'd have made the hole bigger.