brake issues, help me get my car driving

I didn't see mention of a proportion valve. I don't know if having or not would be a factor either.
I have seen a whole bunch of master cylinders die during the bench bleeding process.
They'll get stroked several times as fast and much farther at the vise than they ever would in normal service. That isn't the way it should be done.
I don't know that's the case here either. Another master cylinder is the next thing I would try.