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10.5V of amplitude here explains pretty much about image size. Even if C558 is dry perhaps this occurs (bad HOT biasing in cutoff).
About base of Q501, either sync amplitude and HOUT amplitude will affects if it will rectify excess amplitude (and provokes the desired negative base voltage). But any R, C or diode can be culprit in the path. Or, simply the flyback have a very unusual fault and behaves like it are mistuned..... then a experimentation with C560 (the resonant cap one), adding a little or subtracting a little (put a 2nF/1.6kV poliprop in parallel with it), to see if pulses rise. But I advise to try to find the driver cause first.
I just remember to made this in the past in one misterious behaving TV.
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So many projects, so little time...
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