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First time I've ever attempted to calibrate a PVM via internal trim pots. This one's struggling real hard to make blue happen. I know I have some more knowledgeable CRT friends on here - any tips for diagnosing the problem?

Sounds stupid but have you tried a different source and video cables? I’ve had at least two instances of the problem being at the source of the image and not the CRT. (Dodgy analog IO board from eBay, and later an inherent issue with component encoding on MiSTer that only showed up on trinitrons.)