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Ok it's starting to all make sense now.
The assumption here is that for the most part I've enjoyed shooting emission nebula which is why I was at odds with your initial comment of having no benefit.
The colour balance thing may actually remain an issue. I was thinking still emission nebula and solve any background problems with a histogram stretch, but the nebula are never in the photos on their own. The stars will have the same colour balance issue so you can't confine the colour correction to only darker background. Hence my guess the noise.
Hmm this will require pondering.
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