Sentra clutch problem

My wife has a 1998 Nissan Sentra GXE and she was having shifting problems. These problems seemed to be caused by the clutch not disengaging the engine like it should. I replaced the clutch cable (thinking it was stretched after many years of use), and then adjusted the clutch according to the shop manual. This took care of the problem for about a year, but she started having the same problems, so figured it was time to replace the clutch. Just before replacing the clutch, the clutch pedal started not returning completely until you pulled it up with your toe. I could not find anything that could cause this problem.
I just recently replaced the clutch, pressure plate, flywheel and throwout bearing. When I went to adjust the clutch cable, I found that the cable is at the maximum adjustment and the pedal still does not return to its normal spot. The only thing I can think of now is the throw out bearing is the wrong one or the pressure plate is incorrect. Is there any place to get the specs on both of these items?
Does anybody know of any other possible reasons for these problems?