You'll need to change the clutch slave to improve the feel, the lever won't do.
This is one of the best ones.
http://italianmotostyles.com/oberon/OBERON-Clutch-Slave-Cylinder-Ducati
This is one of the best ones.
http://italianmotostyles.com/oberon/OBERON-Clutch-Slave-Cylinder-Ducati