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The wiggle would also indicate something in the Horizontal circuit that isn't up to spec.
Are there any capacitors inside the High Voltage cage that you might have overlooked? Also the resistors and capacitors in the Yoke cold be causing problems.
A bad Flyback can also cause this as can a bad horiz output tube.
The white areas twinkling is a separate problem I suspect, does that go away if you turn the brightness down?
White objects taking on a silvery appearance when the brightness is turned up high can be a sign of a weak CRT.
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