Getting Better Black and White Scans from a Digital Camera

I'm testing various settings to figure out how to get my best possible scans.
expose the right? middle? left?
light color?
white balance?
aperture?
focus spot?
image stabilization?
Did I make any progress today?
My process for testing should help you figure out your best process. I'm testing with a Leica SL2-S and Sigma 70 Marco ART lens.
I scan/capture into Capture One.

[@gamincurieux]

Excellent video, very informative, gave me a lot of food for thought (for example, I'd never previously thought white balance ever made a diff!), thank you for your effort in putting it together.

[@DanMars27]

Surprised me how much that mattered. If I were to remake the video, I would take my time through the WB section.

[@Lawman212]

The difference is subtle to most people, but I would expose to give the greatest latitude in the important parts of the picture. In the case above, skin tones might be important, so I would expose to allow the greatest latitude in skin tones, which is Zone 6. I would be careful not to clip highlights though.

[@DanMars27]

that's where I'm settling into as well