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David, I can't see anything wrong with the blue channel, at least at a histogram level. Cluster resolves well. Only concern would be the blue/green fringing on some of the stars. This could be a registration error though I suspect you have probably got a few subs with a higher FWHM value that is influencing the blue/green masters. Try removing the culprit poor subs to get matching or as close to FWHM values across the RGB masters. Sometimes less subs of a good quality is more than many subs of mediocre quality.
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