Which power cords have high resolutions and separation??

First, start with a dedicated 20Amp circuit with a whole house surge protector ($ varies) wired with 12 or 20 gauge wire and a Hospital Grade receptacles ($12 ea). Next get a good cheap oscilloscope off eBay or C-List and see if you've got any RF riding the 120V at the outlet, and if you are really properly grounded. If that's clear, any 10-12 Gauge power cable will work. But none of them can fix dirty incoming power. Everything else is voodoo physics and confirmation bias. 'Removing a veil' is usually reducing noise. "improved dynamics requires dV out > dV in (change in output greater than change in input. A physical impossibility unless you have an actual expander circuit in play (remember DBX?)

A power chord is a two note chord that is neither major nor minor. Savvy music theorists will note that this is because it only consists of the root and fifth notes of a given chord. Since the third is what determines if a chord is major or minor, power chords remain neutral.

So there you have it, power cords, lacking a third, remain neutral. Save you money.