I wish I could help you, I just don't have any Benjamin Moore color swatches.
I do have a good set of Sherwin Williams, and Porter Paints. I would definitely have to see, to make an informed opinion. Light colors in the stairwell are good because they help brighten the area. It doesn't take much color to cancel much of the reflectivity and the light diminishes accordingly.
The plan sounds good to me,
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