"The stock flywheel is a complex dual-mass piece with separate front and back halves separated by springs. Supposedly this can't be resurfaced, so if you're already replacing a clutch (shame on you if you burned it up this fast) a light flywheel may actually save you money over replacing the stock dual-mass."
with that said the chatter is from the flywheel loading and unloading.
as far as the engagement... get used to it USUALLY the higher the tq rating on a clutch the quicker and higher its engagement is. and we all know the vq37 is not a slacker in that department