There’s a dampener box on the clutch line, it has its own bleeder screw, you either have to bleed it, or remove it.
It’s located on the frame rail, about a foot before the rubber line that goes to your slave.
I suggest you remove it and bend the hard line (being careful not to kink) that goes into the box coming from the master, to attach directly to the rubber line.
Nope, i was wrong about the air in the line! As stupid as it was when i was paying attention to the bleeder screw my buddy topped her up without telling me it had gone all the way down! Needless to say he confessed after we fixed it! Man was it a huge bubble of air!