You might have to try bleeding the cylinder at this point, then re-bleed the line, and finish up with re-bleeding the cylinder again since it's at the top of the system where the air will migrate to. Be sure not to "pump" the pedal... just open the bleed valve, have a helper push the pedal once and hold it down while you close the bleed valve. Only then can the helper release the pedal. Repeat as necessary to clear the lines of air. Bleeding the cylinder is as I described earlier.
Edit to add: Make sure to keep an eye on the reservoir because if it goes empty at any time while you're doing this, you'll be starting at square one again.
[This message has been edited by Bloozberry (edited 05-04-2014).]