I'm a great one to give you an answer, since I just posted a question about
a clutch, but what the heck...
If you have replaced everything internal, have you checked to make sure you
are getting full travel on the release fork, or arm? Have somebody in the
car working the clutch pedal up and down, and watch and measure the travel
on the release arm to make sure you are getting enough travel. Since the
clutch is not disengaging completely, it might be you are losing the cable
movement somewhere, either at the pedal end, or under the hood.
Did you try the fit of the new disc on the trans, input shaft when you had
it apart, to be sure it fit freely on the shaft?
Hope some of that helps. Good luck.