for what it's worth, I have a Hennessey.
I also have an TQ which works far better than a sleeping bag.
this summer, when it was hot, I used a silk liner.
AFter a couple of troubling nights, I decided to stand up right next to the hammock, step into the cocoon, sit back into the hammock and endeavor to sleep. It was so very terribly uncomfortable squirming all night.
If I HAD to do it, meaning using a zippered up bag, I would un-zip it down to the foot box and use my sleeping bag like an TQ.
as a side note, I eventually modified both my 15 degree Marmot and 20 degree North Face to quilts. To sleep in a zippered up sleeping bag was too much effort.