Hanging in a Hammock is all about the angle of the dangel (Sag). It determines the strength of cordage needed to hold you up, it impacts on shoulder squeeze and also on how flat you can lay in it. 30 degrees is quite often quoted, but it all depends on the width and length of the hammock itself. Short narrow hammocks are better pulled a little tighter to counter lying like a banana, but not so tight that you cant make the most of lying asymmetically (say 25 degrees), wider hammocks can be slung a little slacker as the width lets you lie flatter asymmetrically(35 degrees), when using narrow hammocks it is finding the right pay off between shoulder squeeze/flatness and can vary between 35 and 10 degrees depending on length of hammock. I have a Tenthwonder hammock that is a little narrower than I would prefer but at about 25 degrees I can get pretty flat on the asymmetrical lay without suffering too much squeeze on the shoulders. Knowing roughly what my angle of dangle means that I can begin to tailor my cordage to my weight. What many people forget in calculating forces for cordage (in particular with structural ridgelines) is it is not the angle of the hammock referenced to the horizontal, but the angle of the suspension referenced to the horizontal that determines the tension in the suspension. I hang on a single line, which I pull to about 10 degrees, with my hammock fixed at 25 degrees. The single line for my weight + equipment(and a fudge factor) needs to have a breaking strain of at least 300kg. If I pulled it uber tight say 5 degrees then that strain would need to be 600kgs. Happy hanging!