I've never heard of using knots with wire.
And why coated? It costs more.
Use a swage tool and ferrels and thimbles for the wire.
Big turnbuckles are not expensive and will let you tighten up the rig very evenly.
Don't try to cut stranded wire with normal wire cutters. You need this kind:
Alternative to doing it better are these things, which are a total pain in the ass and perhaps will fail, but they are cheap. Use two on each connection for safety:
The better way is with "ferrules" (those little aluminum things, also called "aluminum sleeves") and "stops" at the end of the wire. The tool is called either a swaging tool, a ferrule crimping tool, a swager, or a Nico press:
If you don't want to spring for the expensive tool above, there are these things which are fine if you don't have a lot of ferrells to crumple: