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Having more darks than lights is nonsense. You want to capture light. The more signal you have, the less noise you'll have. I'm not saying to take one or two dark frames. Take at least an hour's worth. More if you can. But, it doesn't explicitly have to be more than your light frame count.
Les, you're mixing exposures, aren't you, as in, short exposures along with long exposures, correct?
I am almost certain that your problem is that you're not using matching dark frames to light frames. My guess is that you're using your 10-minute darks to subtract from your short exposures.
Regards,
Humayun
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