Keep digging. A 21-CT-55 flyback can kick out 30+ kV unregulated. Is your fly damaged?
If it is, I'm going to suggest something that is anathema to most around here: use a solid state HV supply. The set is not working correctly in the first place, so originality doesn't count for jack at the moment.
A solid state HV supply would get the set performing closer to how it was designed.
Best of luck in either case.
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