> Obviously i am looking for the lightest material to safely and reliably hold my
> weight, not just until i move. Thanx for the helpful post! :)
Oh, I try ... my wife says sometimes I am very trying ...
But more seriously, you do have to plan for dynamic loads, which could require a factor of over 3x, and one also needs to make some 'safety' allowance for wear and tear. It all adds up.
That said, nylon *does* have a large stretch factor, so it is OK to see a bit of stretch under load. The old BS3104 UK Standard for nylon climbing ropes specified that the rope must handle a 60% stretch before breaking. And there were a few times we did see a bit of a bungee cord effect when someone peeled. Mind you, the general rule was to retire a rope which had experienced a significant leader fall.