I use a double 8 foot run of Duelund 16g for a total of about 13ga and have been very happy with them. More extension and tonally denser/saturated within the images to my ear than the single run. Trying some other pricier cables now, but haven't found anything to displace them in my system yet. To be fair, I've tuned my system (yes, tuned) with them in place, so matching and/or improving on that becomes more of a challenge I imagine.
If that's the case after the next two, I'll likely give a single 12ga run a go (they make a nice tidy 2-in-1 run) for the fun of it and try to remember to report back.
FWIW, I used splitter and the Schroeder method with various sets of IC's and loved it for a while, but eventually the portrayal was overly saturated and off-putting with smeared tone and timbre sounding less crisp and accurate. So, maybe something doubled, something troubled - not being wed to any of it and remaining curious.....open ears, open mind. Open heart? "Free your ass and your mind will follow" (Funk Philosophy 101)