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Looks good. I'd probably just solder the other end of that pigtail to the terminal of the other tube socket (gently!), maybe creating a loop with the old wire to hold the pigtail to the terminal when you solder.
As far as vertical linearity goes, did you replace the vert out tube's cathode bypass cap? I had one go bad, and IIRC with it bad I couldn't get reasonable linearity.
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