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Best focus should come somewhere in between, not at one end of the control's range. If you're still getting sharper as the control hits max, that's a clue as to being under or over voltage.
I'd look at the divider resistors, and IIRC, they can acty funny at high voltages too. I think they're all high ohmage and prone to drifting anyway...
Sneaky leakage paths loading things down could do it to - the HV supply on these sets has less than zilch current....
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