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I GOT IT!
I disconnected the ground wire from the new couplate and the picture locked, but with some jitter. Then, I experimented with various value resistors from that lug to ground. A 22K locked the picture in solid. Technically, the chassis is now not original due to this modification, but it works. Tomorrow, I'll do the rest of the "smoke test" (that is, I'll play it out of the cabinet for a few hours. If it doesn't go up in smoke, I'll take after pics and put it back in the cabinet).
I did not find anything goofy in the other related circuits. It had some 1M resistors, which I thought had drifted, but they didn't. My thanks for confirming my suspicions about the cap values in the couplate.
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