Hi Chris
I noticed on your image of NGC3324 (very nice too by the way) you used Startools for processing. Startools prefers that white balancing is turned off in stacking and let the Startools program do the white balance.
This happens when you go into the colour module and the correct CIE lab colour is then produced.
The theory is all explained on the Startools website/forum.
Cheers
Bill
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