I can attest to over 400 lbs in my hammock... Me, my wife, and our dog. The dog was moving around quite a bit too. I have no concerns with 7/64 Amsteel, though I would be reluctant to go to Dynaglide... Not necessarily because I don't trust it, but because the weight savings is not worth the potential for failure for me. Hang your own hang.
"We're the Sultans of Swing."