Paxton

I have a '91 SE and can not get the clutch adjusted right. I have recently put in a new clutch disc, throwout bearing, and rebuilt slave and master cylinders. The pedal height will change. One day it will work at the very top, the next day it will work at the very bottom, with 2" of play at the top where it does nothing. In order to get the pedal to return to the top, I have the pushrod (pedal freeplay) adjusted all out. Has anyone had a similar problem or have any ideas?
Thanks