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I've never had any pinching issues with Ed's polypro webbing. I also don't hang my hammock so tight that there isn't some 'give' to be able to work it lose from the hammock end if I needed to...
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IMO, webbing with cinch buckles and Dutch clips. No knots do deal with (well, maybe a backup simple slip behind the buckle) or small diameter rope to have to 'pinch'.