PS: really light weight crank also has the effect of raising its natural frequency (in Hz), and pushing every destructive harmonic order higher in the RPM range.
This is probably within the capacity of any good S.F.I. 18.1 damper, but it can be both good and bad.
Good: the harmonic order you now have at the top of your scale may no longer affect you.
Bad: you may inherit one from below your normal power range.