Philip,
Your images posted look spot on at all the stages, your RAW is as my 450D would see the same object. Remember with a camera which has not had a mod carried out you will not see the reds as well.
Your stacked image looks good, you can slide the saturation in is DSS or do as you have done in your post processing.
Your final image looks spot on a really good shot. Auto white balance is fine as it will not make a great amount of difference as you can tell DSS to reset white balance during processing, Nebulosity does not even use white balance.
Hope this helps, worry to much a great final image.
Carl
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