I have made several dynaglide nacra biners and have hung on them without trouble. I added a cobra stick slide to give me more confidence and use the diamond knot because it gives me a larger area for the loop to hold to.
For my ridge line I have a sliced eye in my 2.2 zingit. I wrap this around the tree and attach it to its self with a nacra biner. On the other end I I have a figure 9 attached with a 1.75 zing it prussic. Very quick and adjustable.