One of my fav sleeping hammocks is an 11' double from Dutch, great Hexon fabric. It's got the Knotty mod for footbox I get as much diagonal as I can (after the 30* suspension angle and 87% structural ridgeline, foot end a little higher than head end.
A big deal for me is to get something behind my knees an old closed cell pad rolled up, or a pillow, something about 5" in diameter seems to cover it. It feels a bit like a sweet recliner with a warm back provided by the under quilt. It's like you're on a cloud.
It takes perseverance for perfection to come together. Worth it.