lighter flywheels are supposed to make the engine rev much quicker, if I'm not mistaken.
I have Fidanza flywheel waiting to be installed in my pile of parts, but not doing it unless doing the clucth at the same time, so that'll be a while. once I do my bits, the aim is to minimise downtime AND labour costs by doing parts that are connected (like clutch, flywheel, clutch line) at the same time...
PS a little judder is normal afaik