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If by "grip" you mean "holds more torque", there is absolutely no difference between a 3, 4, 6, 8, etc. puck disc assuming equal puck size, equal radial distance from the center of the disc, and identical puck material. How much torque a clutch holds is a function of: the coefficient of static friction between the flywheel, pressure plate, and disc materials; the force with which the disc is clamped between the pressure plate and flywheel; and the length and distance from center of the pucks in the radial axis. More or less surface area in the circumferential axis has no effect on torque capacity. Less pucks do engage "harsher" because they are lighter. They also dissipate less heat on account of reduced surface area.
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