i get no chatter at all, if your really horrible it might chatter a bit or stall out but it does not chatter for me at all.
the ability to slip the clutch is much greater than with the 4 puck, reason for this is with a lesser pucked clutch disk you have more pounds per inch than you would with a 6 puck, this allows for more slip and less grab right away.
the reason for the springs if for engagement purposes, you will always be able to slip the clutch more with a sprung disc versus a unsprung one.