hey radio, on the back side of the drums, theres this opening going in, well if you take a flach light, and look in, you will see a star shape wheel, spin it either way that tightens the shoes. have the wheel off the ground while doing this. do a little bit first, then spin the wheel. if it got a little harder to spin, thats good. if it didnt make any diference, you might not have gone far enough, or you went the wrong direction... but i think you have to spin it up to tighten... good luck!
also one more question, you said you kept bleeding them, but you kept getting air in the lines? what procedure did you use to breed them? did you do it in the right rotation? are you loosing and fluid like a leaking line somewhere where air could come in? all the lines were good when i had it, it just needed new shoes, and a readjustment. i also had my thoughts on the new master cylinder.