Car fault diagnosis is certainly unpredictable at the best of times but that's an unexpected discovery. I gave up on clutches decades ago so I have no knowledge of the 75/ZT system or the Tazu but I'd say that it's time to revisit the work you did 10 - 15,000 miles ago and inspect it for a developing problem.
I think that you can forget about the flywheel being the cause.
I'm interested in your stethoscope. Can you post a link to it please?
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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