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Nice job, Tim.
I found G2V calibration wasn't that helpful since conditions change from night to night and don't affect the filters equally. I also experimented with eXcalibrator which I found a bit better. In the end I've not found a single method that always works reliably.
Wrt star colour fringes, a useful technique is to apply a star mask and blur the chrominance. You may need to boost saturation of the stars again afterwards. In PI you can achieve the blurring with MultiscaleMedianTransform. Just remove the bottom few layers and make sure you set Target to Chrominance.
Cheers,
Rick.
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