I mean two individually twisted pairs, not just 4 wires twisted up. Or now three individual twisted pairs.
What happens at high frequencies?
With three twisted pairs, you rail to rail load, and rail to ground loads, all have the optimum conductor. It seems like the return current will then always have a best path to follow under the source current. I imagine its not happy with two individual twisted pairs, but what if it has a favorable third path?
like if you have a combination of fully +- and ground referenced loads at the end of the power supply? I.e. 1 resistor between V+ and ground, then another resistor between V- and ground, and another resistor between + and -.