For what its worth...
I weigh 180 lbs. I used 200 lb test Muzzy Bowfishing Line for my ridgeline. Actually took 2 strands and braided them together. I have hung with the ridgeline with some slack and as well with it guitar string tight. I am a thrasher when I sleep as well, so there must be a ton of stress on the line when it is tight. No problems so far (knock on wood).