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Looks like the whole vertical section runs off the boosted B+ supply. I still vote for video leaking into the vertical sync circuits. If the boosted B+ was unstable, I'd expect to see non-linear horizontal sweep, plus trace dimming and blooming as well. I'd take that scope and look at the sync signal at R401. Also, look at the grid of the 6S4 and see if tou have a decent sawtooth waveform there.
If you don't have a clean ramp-shaped signal, I'm gonna push you out on a limb and (with others agreeing, it's not my TV here) suggest lifting one end of R 401 and see if you can get the vertical oscilator to sit still long enough to see if that clears up the distorted sweep.
One more thing. Did you REALLY check your work when you were done? It just takes one wrong-value part or one wrong connection to mess it all up. Just for the heck of it, recheck the vertical and sync circuit wiring really close. Good luck!
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