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Fluidamper also claims 2lbs of rotating mass does not behave as rotating mass...
I know nothing of harmonics in an engine, but I see only that harmonics exist on all 3 pulleys, with similar magnitude, but in different orders and rpm. And the OEM pulley seems worst of the bunch on that 2nd order line... But what's actually destructive? No idea. I tried researching but haven't found any materials...
It could be NVH is the only reason for a damper pulley.
Of course, the OP's wobbly install would definitely be bad.
C
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