Currently I'm using the paracord as well for my tarp, and I do agree it's stretchy but it works for the time being. I'll spring for some amsteel when I eventually get around to making some whoopie slings. I have an HH and I didn't care for how close the tarp was to the hammock when set up according to the instructions. It made me a wee bit claustrophobic when I had attached to the hammock suspension. Also I noticed it would slip when tension was placed on it. I don't know any of the fancy knots but I simply tied loops at various distances on the paracord which allows me to adjust the tarp so it's properly positioned over my hammock. Shug's videos are more than entertaining and will provide you with ample information on hammocks.

Sunny