ok, so i understand the reasoning behind the addition of the damped pulley, but from the Questions ive put to my friend at TTE in germany who incidently is an engine /powertrain engineer for Toyota Motorsport, he has told me a few nuggets of infomation that need to be considered.
the damper pulley is designed to only work at low rpm of the crankshaft when the rotational mass doesnt automatically balance the crank, as the speed of the crank increases its mass will cancel out the vibrations, also, the damper will only be effective on a std engine, i.e no change in the designed mass of any of the componenets in the Engine or power train.
so if like me you have a lightweight flywheel, HKS multi plate clutch, different rods and pistons, then the damper is in effect, doing nothing, as the engine vibrations are now outside of the design parameters of the crank damper.
even a simple aftermarket clutch has enough difference to cancel out the crank damper