Almost the same issue I have
https://lateral-g.net/forums/showthread.php4?t=54867
I have the front brakes bled with no air and the rears still some air which will not leave. The fronts lock up with very little pressure and I need to push the pedal to the floor to get the rears stopped (with a soft pedal). I bought the phoenix bleeder and will try it tomorrow. While reading the instructions they made a comment to make sure the MC is level! Boom a sledge hammer hit me in the forehead mine is raised to start with not to mention I have the front jacked up a little higher. So I will lower the front and reverse pressure bleed it and see what happens. Good luck