[GuusV]

I wonder if you have a leak somewhere. Maybe missing a compression ring on one of the connections?

While you're bleeding the slave, are you seeing any fluid/bubbles come out when you open the bleed valve? (make sure you close that bleed valve before allowing the clutch-pedal back up)

 

[GuusV]

You should have a good solid sequence of only fluid coming out for about 3 or 4 times. (so, if you get a bit of air a few times, don't stop. Keep going until you get only fluid 3 or 4 times in a row)

The process should be: (really requires 2 people)
1) apply pressure to the clutch pedal (push it to the floor).
2) open bleed screw on slave and let fluid/air escape, make sure that the pedal continues to have pressure on it, press it to the floor and keep in there
3) close bleed screw
4) "pump the pedal" (4 or 5 times). This may have to be done by hand if the pedal does not return to the up position on its own (move the pedal by holding on the the foot-pad with your hand)