If you want to improve the crappy feel change to a easy pull lever, changes to the clutch plates and springs wont help at all.
You can mod the stocker to make it a easy pull lever or buy a new lever, the rightous stunt clutch lever is popular, the msr and moose easy pull levers will work good too.
Easy pull clutch levers make the friction zone longer as well as make the lever easier to pull, basicly you make it so you have to pull the lever almost twice as far before the clutch disengages.