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I know I am repeating myself on this. But the similarity of what you depict to the problem I had on my 1948 RCA striking. I was in a similar dilemma trying to determine the twitching in the video when I found the 500pf hi-voltage filter with a crack. The were tiny sparks in the crack which I could not see but heard and located them by using a listening tube around the hi-voltage cage. The ticks coincided with the twitching in the video.
The hi-voltage capacitors generally have a clip which you can remove. (The aquadag provides ample filtering anyway). You may wish to disconnect the capacitor just to see if the twitching disappears.
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