| Does your pressure plate contain holes over where the clutch centre pushes the plate out when it rises up the ramps? If so, measure the clearance between the underside of the pressure plate and the clutch centre with the clutch fully assembled. For the two slipper clutches that I've had (Ducati and Sigma) the gap should be between 1 and 1.5 mm, i.e. the centre has to rise up the ramps by 1 to 1.5 mm before it starts pressing on the pressure plate. Measuring the pack thickness out of the clutch means that you don't allow for the dishing on the dished steels. With the clutch fully assembled the clutch springs will have compressed the dished plates and you'll get a better indication. | 
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