So, I took the advice of members here and talked to my brother. He's a Marine who used to be in their Mountain division.
I was talking to him about SRT and DRT, and he said that the DRT, with one rope, isn't really a DRT, it's a Doubled Rope technique, as opposed to the Double Rope Technique.
I think I'm liking that. He says he just uses a prussic knot, above the Blake's, but a biner attached to a chain, then to his harness. And that is his safety. At the end of the Blake's, he ties a figure eight knot, to stop it from slipping. He said if in trees a lot, They only use 1/2 arbor rope, only like 6500lb test he said.
Does this make sense? I'm not sure I see too many flaws with it. He also gave me a really great idea with a sling-shot and a 2oz sinker with 50lb spiderwire. Looked sound to me.
Thanks everyone for your endless patience. I'm like a struggling doctor, I have none.
Jeff