I made all the stupid mistakes with power that are possible, including not checking the electricians work when he set up a reversed neutral one of the times they wired my room.
I have a large house with sub power panels, I didn't take my home run lines to the main panel but to a sub panel. Stupid I know. But then again if I did go to the main power connection to the house that is still a sub branch of the power on my street and in my part of the neighborhood. So I bought 2x power reconditions PS Audio P20s and I already had about 5 different kinds of old power conditioners from studios.
I have lots of powered speakers so I need different legs simply for current. If you don't have to use different legs you are better off because there will always be a different voltage between neutral and ground on separate legs, the voltage difference between neutral and ground is buzz. Yes get the biggest gage cable you can, it doesn't hurt especially that in the future there will be a lot more current usage for powered speakers.
Power is odd it's very simple and at the same time can be a mystery and suck lots of money towards ends that don't make audible differences in the sound of your equipment.
