One can never be too careful, but I think Rain Man's calculation is quite a bit more conservative than any other I've heard. I'd feel comfortable using 1000lbs breaking strength on my setup...I'd just be careful that it never got unnecessary knots in it, no damage from UV/trees/etc...and I'm always pretty careful about not bouncing in the hammock. I do usually swing, though.
Anyway, I think it would hold you but there's probably more suitable cord for supports...hard to say w/o seeing what you have. Does it have a sheath? Is it stretchy under a heavy load? Lots of considerations. But even if it's not suitable for supports you could still probably use it as a ridgeline, at least.
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IMPOSSIBLE JUST TAKES LONGER