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Cyberman - Thanks! I usually do noise reduction later in the process, I hadn't thought of trying it with linear data before stretching. That might be worth a shot.
Oska - Thanks, too. I certainly don't feel like things are stepping up. I used a series of small GHS (General Hyperbolic Stretch) stretches in Siril, not one huge jump. Small steps seem to work a lot better. I'm not that far off unity gain (100 vs 110), so am a bit doubtful increasing the gain will make much difference - and also increases the risk of saturated stars.
I suspect that if I was to return to SL17 when there was no moon in the sky then I would have a better outcome. Imaging during the full moon (even with clear skies and an L-Enhance filter) is never optimal.
Cheers,
V.
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