Kevin,
I first used it without a ridgeline and did not really experience any problems, of course I am careful about hanging it to get a good hang angle and sag up front. DD recommends a tighter hang but I have found just for myself the typical 30 degree works fine. I have since however added a ridgeline, more so for hanging things that anything else. I only use it when I flip the hammock over to use it without the bug net (which you can do), then the ridgeline actually serve to help set the sag. I made the ridgeline from zingit with a carabiner so I can detach or attach as needed. I find the DD very comfortable and I side sleep in it easily. I'll have the DD there in Nov. if you don't get one before then and want to check it out.
Blessings,
Semo
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