I don't know if many people have the capability to measure 0-60.
What are you using, a G-force? or whatever they're called..
Maybe 60 foot time instead? It would take some variables out of the equation.
As for the clutch/flywheel..
In my uneducated opinion, a lower weight (thus inertia) flywheel will make launching that more difficult.
As you already know, too low an rpm = bog. Too high = boil. Neither of which helps get you out of the hole. Now, reducing the inertia of the flywheel will likely make the launch sweet spot that much harder to access.
However, once you find grip the lighter flywheel will "free up" some power, thus reducing your 0-60 time. So it's a compromise. I'd like to hear from someone with actual experience first.
A clutch won't magically reduce your 0-60 unless the current one isn't doing what you ask of it, which is probably the case. If it can't hold the power, or won't modulate effectivly, get that new clutch.