Jan,
It sounds like you have a frustrating situation on your hands. It is very possible that something is wrong with the pressure plate. However, the problem could also be in any of the hydraulic components. I would start at square one. Get the car back on the lift, take the whole clutch assembly off the engine, including the flywheel. Bolt the pressure plate to the flywheel with the disk in place, as if it was in the car. Then go to a press, get an old mechanical throw out bearing, mount the assembly in the press, and simulate releasing the clutch by using the press to push on the TOB. You should not need more than .5" travel at the clutch fingers to release the clutch. Examine the action of the spring fingers to see that the pressure plate is lifting from the disk as you press on the clutch fingers. This is the only way to check if the problem is in the pressure plate.
If everything looks good mechanically, then your problem is most likely in the hydraulics.
Andrew
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