Interesting suggestions and findings Colin - thank you for sharing.
Just going purely from theory, or at least from what I think makes sense, is that Luminance collects more photons from the target per hour of exposure (given the skies are sufficiently dark) than RGB filters that block a significant portion of the signal from a given dso, therefore I would go with as much Lum as practical to maximise SNR at the expense of less time dedicated to RGB filters.
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