check your plates to see if there worn, and the alignment marks on the pressure plate against the mark on the clutch boss should line up.
and then if all that is good then you just need to play with the rod that is connected with the pressure plate and make it either shorter or longer depending if your clutch is slipping or grabbing too much. Thats done by threading on or off that nut in the back of the pressure plate where the rod starts to go through it.