Interesting thread that has me contemplating my next builds. I have primarily used Canare 4E6S for most of my recent RCA/XLRs. I do feel having double conductors does provide a performance boost. May have to look at larger AWG as it seems to have a consensus here.
I have used various wire from Chris VH over the years and may go back to his OCC Airlock. What I'm curious about is using bare OCC copper. Wondering if that would be a good option.
Looks like some type of Helix configuration is in my near future....