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I do not think of a flywheel as a component of natural frequency damping.
It can be out of balance but that should be obvious (vibrations)
If it wasn't damping natural (resonant) frequencies of the engine in question then that is a whole other story (you would not feel that happen, and it will show as 'perfect balance' with respect to mass)
If you modify the inside of the engine and the natural frequencies change, then something needs to be done about new emerging natural frequencies. Typically people throw a fluidamper and go. I presume that you have a fluidamper and are not trying to utilize a stock damper with aftermarket internals. -.-
also what was said about using tight (factory) clearances with heavy weight oils is correct (=failure)
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