Powershift second and clutch pedal stuck to the floor.

Title tells it all. The clutch hasn't been what I would call "right" since I replaced it when I rebuilt the engine.. That was the first one Could I have the z bar in backwards? The original clutch had throw or stroke. (easy to feather and the friction point was a inch or so between engagement and disengagement) Both the new clutches release close to the floor and are very touchy. They are either engaged or not with a inch or less travel in between. (Like a racing clutch in a stock car if you've ever experienced one.) The pedal doesn't return to the top by itself either unless I lift it with my toe. I have tried 2 clutches and have replaced or rebushed all the linkage. I didn't change clutch types so I shouldn't
have to remove the over center spring. The clutch is smooth but almost feels too soft or spongy. Any ideas?