What you have is very good. You can see the fainter detail at the edges petering out with noise. More subs will help and as you have good control over the dynamic range already a few longer subs should help. M42 is not easy. What you have is great. Keep working at it. SCNR the green channel after the first histogram stretch with no mask in PI. If you haven't done so.
Pleaides...? Another challenging target...
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