No return springs, the pressure of the clutch fingers acts as the spring.

Mine did that to me to, I had to bring it up a little as it would not return. After 100 more pumps and every 10 times holding it to the floor for about 10-15 seconds. It returns great now, just had to get all the air out.

 

Are you sure the clutch fork isn't bent?
A few people have said driving on a bumpy road (like gravel) for a few miles helps to jar loose any air bubbles and get them to work their way out. You really shouldn't have that much of an issue after the bleeding routine you've described.

 

Park it with the front end up hill-STEEP- and pump it; go to bed, pump it before breakfast, drive to work. Every truck in signature is manual, all but the '95 and '90 we have changed clutches and or slave/master cyl. It's a little science and a little art at times.