If you guys using Clarks are not using the single tarp line above the tarp you should be. It is MUCH easier to get the right hang and adjustment on the tarp and associated net. Just run a single line betwenn the two trees you are hanging from. Using a Prusic loops and s-biners connect the tarp and associated netting to the line above. The Prusics allow you to slide the tarp either way for correct adjustment.
I use paracord becasue it has give to keep from gettng too tight. I use a bowlin loop to connect the line to the tree on the foot end and a truckers hitch to pull it tight on the other. If you need to raise the tarp it is easy to slide either end or both ends up the tree.