It seems to me that your master cyl. has an air bubble that you can't get moving.
Try back bleeding.
I used to use a small oil can/pump with the clear tubing. Filll the can/pump with 5.1 and pump the master cyl. full through the slave cyl. bleeder.
Go very slowly and at times stop pumping the oil can/pump and "tickle" the master cyl. lever, you will see tiny air bubbles coming up past the clear plastic guard inside the master cylinder.
Also make sure your handle bars are turned so that the master cyl. is at the highest position possible, usually turned fully to the left.
Just go slow and don't get in a rush, it'll bleed.
Hope this helps