ah, you don't have the (old style) centax then? The 0.8 module clutch kit is a full centax clutch (flywheel, engine mounts etc), you can adjust the engagement point. you could just change the bell if you can find one, the 0.8 pinion gears are compatable with Mugen and Kyosho so if you can find a bell to fit a standard 3 shoe clutch you could go that way.
I don't know about performance difference, its supposed to be more efficient but upgrading from a 3 shoe clutch to centax is a big plus for sure
you would then be able to adjust the clutch engagement point - this can be done without taking anything apart..