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Lovely image Paul and a great first light. Noise is minimal but probably came from using Gain 0 for narrowband. For narrowband the usual strategy is to use high gain with its lowest read noise and longer subs like 600 seconds.
Its a pain because Sky X and I think other programs don't let you change gain etc mid an imaging run. So you have to stop once you've gotten your LRGB and change to high gain and do your narrowband.
When processing then you need a 2nd library of darks, bias for the narrowband. You may be able to reuse your flats but trial and error will confirm that as flats are about uneveness of illumination not noise.
Greg.
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