You certainly have some good data there. Colouring has been a bit off so far and the closest one I have liked is one that Trevor played with last. The tough part of this galaxy is getting the magenta and blues right.
I also think you need a lot more data. I spent 10 hours getting the data for my image and I am pretty happy with the result. Because of the low surface brightness of this object it can present with more noise than brighter objects due to the degree of stretching.
I can also recommend the HLVG filter too; great stuff for controlling the greens in any image.
Keep persisting and you will get it right, but get more data Robin.
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