Re: low brake pressure
And if the bleeders are not on the top when mounted, you said the rears on centered, you will have to unbolt them and hold the calipers so the bleeder is the highest point. Then the air will rise and should exit via the bleeder.
Also it might be worth it to tap the master and calipers a few times while bleeding, they say air can stick to the side of the castings and a few taps with the handle of a screwdriver will knock them loose.
Did you bench bleed the master? Is the pushrod adjusted correctly?