Might the key here, I would have a back up plan if it doesn't work. Have you thought about permethrin (spelling could be wrong)?
More over the eno hammocks themselves stretch a little bit over the night. Not as much as the original slap straps but enough that you will notice it. If you are hanging one on top of the other, that could make the person on the bottom as little nervous
When you discard arrogance, complexity, and a few other things that get in the way, sooner or later you will discover that simple, childlike, and mysterious secret known to those of the Uncarved Block: Life is Fun.