It sounds like the clutch is binding on the input shaft. If it works sometimes but not under load the slave would only be an issue if weak. However, the slave should only be pushing against the pressure plate fingers. If it also has to overcome the clutch binding on the shaft it would then make the slave appear weak when it is actualy excess force issue.
My car is apart now and the shimming was in range of the .125 to .200 at .176. My clutch would begin to engage about 1/3 off the floor.
If the car is started in neutral on flat ground, it will shift normal, but as stated when under load will not? That would point toward the binding.
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