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I suspect that the 100 pf is OK, so before you mess with it, try this:
Take out the 1B3 so you have no high voltage. Then you can look at the waveforms directly on the the deflection plates of the CRT. See if they are about the same amplitude. If they are, I'm stumped. Maybe the CRT has something wrong with it.
If they are not the same aplitude, remove the two .005 coupling capacitors from the plates of the 6SL7 and swap them. See if the distortion changes. It is possible that you have a bad capacitor from Allied.
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