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One other suggestion I have with the imaging would be to increase the exposure time. You mentioned that you were doing 30 Ha subs, I personally would suggest doing closer to that with the luminance and even the RGB. 300s exposures with a 16803 at what I am guessing is ~ F/7 seems really short to me. The luminance had a background ADU of 15, if it has only been bias, dark and flat calibrated, you may want to get that value closer to 600 to get above noise level.
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