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I have run into it and did the same tried different ones, even went so far as to mod the circuit to a later style (20xc138 to a 20Yc136 or something like that) which worked MUCH better. I was reading the zenith tab book and there was a lot of changes made at least in the early chassis. I did not realize the modern MOV's could sub for a varisitor. Maybe you could try a test circuit, feeding in different voltages to the varistors and monitor the current (this is what I did at one point and it was all over the place) IIRC the books stated that it was not that precise but just that it did vari with voltage. Maybe some of the other parts are just not enough to make up for the variance.
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