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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?

this was exactly the issue I had with @lazerwalker.com's PVM8220 iirc. It was an issue with the analog board iirc, I did a board swap from a working one, but if you take a scope to the test points on the board, the service manual will show you what to look for and how to adjust trim to get there.

I'll throw in another thing that has happened to me before the inductors around the neck board can get tired sometimes and that can cause weird problems like this if the above doesn't work, trace blue back starting at the electron you'll have 2 identical circuits to compare each component to