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I did do some experiments with moving the CRT around. It does seem the vertical distortion is less when I lift it up but it's not a dramatic difference. The horizontal is not effected.
I tried waving some magnets around to see how strong a field is needed to cause distortion. The result surprised me. A refrigerator magnet had no effect. It took a strong speaker magnet to deflect the beam.
Removing the only two major sources of magnetic field also had little effect. That would the B+ filter choke and tuner filament transformer. I did that by running the tuner tubes on 6VDC from a battery.
That's how I concluded the issue was electrical in nature rather than magnetic.
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