Great result Gordon! I'm no expert on narrowband images, but to me it looks like you have achieved a good balance of colours there, and lots of good detail as well!
When you say you have dithering invoked, what software do you use for that? Does it automatically stop guiding, slew the scope a few arcseconds, compute where the guide star should now be (rather than have to re-select a guidestar) and then restart guiding?
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