Thanks for the advice guys. I've had a crack at Startools and Pixinsight trials. Startools crashed 3 times now (without cpu overclock) before I got to the end of an edit, but I've managed to do alright in Pixinsight with my "overclock". It really loaded up and used all my cores and threads so that's great to see.
Anyway, here is a reprocess, there is more detail in the galaxy with a similar noise level, and the darker background seems to be much less noisy. I used a mask to reduce the effects of noise reduction on the galaxy.
There is a bit of gradient in the lower right corner of the original.
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