Cushion button with a 1 ton pressure plate, FUN!! But not in bumper to bumper traffic lol. Twin plate clutch is just more surface area for the friction material and doesn't really affect the flywheels performance as such. Heres a little test to do and let me know, idle the car in neutral and look at the revs then press the clutch and look at the change in revs, shouldn't be much just around 50 - 100 rpm you should hear it before you see it. That will show you how much play is on your thrust bearings on the crankshaft and how much the lightened flywheel will affect the motors balance.