The 6 puck ceramic clutch is mid range racing clutch. If you want harsh the 4 puck has more bite. With ceramic puck clutches the less surface area the more pressure on the availably surface of the disk. A stock clutch is best for smooth take off. Ceramic has 2 modes, go or no go. Once it hits a certain temperature it bonds to the other materials. In large diesel trucks we use a duel disk 4 puck clutch. The pressure plate has flyweights on it so as the RPM increases it pushes even harder.

http://www.youtube.com/watch?v=xE0_82YR31I