Like Alrainbow I'm a master electrician. I thought I knew it all and that I had power that was dirty and needed a conditioner. I have studied my system and a few others I have built out now. In the end, I now power my gear strait from the wall and its absolutely silent. Walk in my room and you hear nothing until you get right up to the tube amp transformers. Then you hear a little buzz.
Just running 10 awg romex is not audio power. I actually believe romex, especially the flat crap today adds noise. So does your equipment. And your equipment passes it back and forth and amplifies is.
And if you have a ground loop somewhere in your house having nothing to do with your audio circuit, that loop is circling around in your main panel, and probably data utility box making all sorts of noise that travels right down your audio branch circuit and into your gear.
The path of least resistance, or so people think, is getting on the merry go round of power conditioners. Yet they wont fix the underlying issue.
I cried for years I had bad power. Unfortunately it's beyond a local electricians skills to figure out the problem. It takes a guy who is a dedicated tradesman in a specific sector of the industry. We have specialties. Some of us do track homes, high end homes, light commercial TI, large commercial core and shell or TI, data centers. There are linemen, 01, 02 etc.
Find a specialist who can fix your power. I doubt there is something going on that is not in your control to eliminate. Then you can plug into the wall.