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Contrast fixed
I decided to try and answer my own question on those electrolytics since I already have them, and the 50uF C3 was directly connected to the contrast pot. I chopped it out, tested and it was open, and changing it made the difference. The contrast works great now.
Now the vertical, which always had a little bit of jumpiness to it for the first half minute or so after power up, is now constantly jumping/changing height/linearity. All this stuff must work together. So now I have a vertical thing to work out. I'm tempted to just change all the electrolytics at this point, but spending time on issues makes it rewarding to find the exact culprit.
Not sure what I'll do yet, but I'm happy to be bringing this thing back to life.
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