Only enough for one good stop. 73 Duster

Okay so it's been a while but today we put on a new master cylinder and booster.
Two things I've noticed:

1) Same problem as before: I can only get the brakes to really lock up if I gradually and slowly push the pedal until it's part way down, then step on it hard. STILL ONLY ONE GOOD STOP! Very frustrating (and not cheap... looks like I didn't need to replace the booster, at least)

2) Pulled off the back wheels and, although the parking brake is engaging the rear brakes, the pedal does NOT. We bled the rear lines again and there is fluid squirting out. Just no action.

Does anyone have any ideas about this? Anyone experienced this?

Please help!