the cable adjustment is just that, to adjust for cable stretch, it has no effect on the internal clutch adjustment, and over adjustment could cause clutch slippage and and premature wear.
the rod/nut in the center of the clutch basket is the only true clutch adjustment, and must be done properly, it is for ensuring the clutch plates seperate enuf when the lever is pulled, it is not an adjustment for slipping clutches either. the cable gets disconnected during the internal adjustment.
the only thing that may help clutches that are already slipping is a good cleaning and stronger springs.
if your gonna go that far to pull the fiber plates, just replace them.
here's some info on clutch replacement...........
http://www.blasterforum.com/engine-13/blaster-clutch-information-35192/
http://www.blasterforum.com/do-yourself-20/m-clutch-basket-install-40531/
http://www.blasterforum.com/engine-13/internal-clutch-adjustment-45716/
http://www.blasterforum.com/engine-13/clutch-adjustment-47733/
i run the tusk kit for $30 sumthin in my black stockish bike, and the driveline performance 240hd kit in my sig bike, $60