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That's indeed a challenge. If the well depth is small then you'll reach the ceiling faster i.e. the pixel charge will fill with undesirable noise from the moon glow over desirable extended object signal. Have you tried altering your exposure times to see if that makes a difference. You are right that there will come a point of diminishing returns.
Have to say given the circumstances, the resulting image is a solid outcome. DBE is fantastic for such challenges.
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