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Due to the action of the AGC, the 1st and 2nd IF is in constant flux, using horizontal pulses and video as reference points, even with garbage video, AGC will try to gain on those tubes via cathode and grid 1, this of course will have an effect on the other tube elements when this takes place.
Where it's hard to be sure why that 100v on pin 8 dropped liked that, it's unlikely that it was because that 275v was low, so it's prob tube biasing and / or related to the age of the resistors in the area coupled with the fact that alignment may be off.
Alignment is all but impossible to correct given the current situation, but upgrading to better resistors is a pain, but rather cheap.
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