Yeah resonance harmonics with engine motion gets pretty damn technical. A lot of the hard-core honda dragster guys/girls used to go crazy with knife edging cranks and super light pulleys but found it to be detrimental to the lifespan of bearings and other related vital engine parts. Thats why you'll see guys running a stock LS crank pulley since it has the most weight/balancing effect of all the B-series.

On another note, I still dont see the CTR pulley on a relatively lightly modded engine, as a problem to engine life or longevity. But then again, it came from a low torque output B16B. Hmmmmmm....