You are shooting with a gain of 200!!! Look at the graphs, that's a single gain, but you need HCG mode, which is gain 252. In that mode, the dynamic range is higher and the noise is lower. Anyway, congratulations on your first light.
Check out the new graphs for the ZWO ASI585MC/MM cameras. The new HCG is at 200, replacing the old 252. All the changes are already in the software. Now, the dynamic range is also 12 stops instead of 11 on HCG.
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