heres some good info from a crank company:

"2. DAMPERS WITH MOVING INERTIA WEIGHTS
A. Fluid, balls, springs, inertia rings with rubber O-Rings, etc. Can
you balance a wheel on your race car if the tires are flat???? How
can your rotating assembly be balanced if to quote one
manufacturer, “These units (Dampers) should not be on the crank
for balancing as the inertia weight may not be centered until the
engine starts.” NEWS FLASH!!!! Centrifugal force will always take
the inertia weight off center no matter what RPM. Your assembly
is never balanced. TELL TALE SIGN!!!! Metal transferred on nose
outside diameter and damper internal diameter . . . A fatigue crack
starts. SNAP!!!! The crank breaks"