I'm a stickler for proper cables, both power and signal cables.
The power in, and signal cables I use coming out of my pedalboard, are all heavy duty, tech flex wrapped with heat shrink reinforcement.
All amps and recording gear in my studio equipped with IEC power inlets are given Music Cord power cables, but they'd be impractical with a pedalboard, due to their stiffness, weight and cost, so I use 14 ga. tech flex wrapped power cords with it.
One significant advantage the Music Cord cables offer is that they're shielded, so adjacent audio cables don't pick up AC interference.
You might be aware of this, but Schmidt offers several choices on their I/O patch bay boxes, including locking XLR, MIDI, etc, by Neutrik. However, I just use the 1/4" connectors that come on their basic box. I don't need locking connectors in my own studio. If I played out with the gear much, different story.
So far, having tried several different power sources for the board, including Strymon's Zuma, and a custom made solution, I found that the transformer-equipped voodoo labs power supplies work best with my gear and cause the fewest problems.
I have zero noise from my board.
Zero. It's dead quiet.
I can have all of my amps on, and the pedalboard switched between them, and none have noise. My amps are all dead silent, too, and they're all tube amps. High quality modern gear should not make noise. If it does, it gets returned to the vendor. Noisy pedals are not an option, either. I use NOS tubes, the modern ones pick up more noise, and generate more rattles, ringing and microphonics.