brake issues, help me get my car driving

Since you bled each caliper real well, and the bleeders are up, I also suspect the MC. Did you "bench bleed" it alone until you saw no bubbles at all in the recirc tubing (clear plastic)? You don't need to remove the MC, indeed I always pump it installed, using the car's pedal. May take 50 strokes to get all the air bubbles out. See youtube. Otherwise, see if there is any "lost motion" in the pedal rod to MC. You can tell that as you bench bleed. Air bubbles should start moving in the tubes as soon as the pedal starts moving.