1965 Valiant low brake pressure

Okay, heres what I need help with. I have a 65 Valiant that stopped better than our new cars, Manual 4 wheel drum brakes. The MC went out so we bought a new one and replaced it and the brakes worked fine for a couple days. Then as old cars typicaly go the added pressure of the new MC blew the seals in the front wheel cylinders (first the left then noticed the right leaking when I was changing the pads on that side). Since I put new wheel cylinders on I have had almost no brake pressure, the car will stop if I hit the brakes really hard but thats shouldnt be necissary. I have adjusted the adjusters to the point of not being able to turn the wheel and backed off to where is barely rubs on all 4 wheels (figured I might as well adjust the back while I had it in the air). I have went through almost two of the large bottles of brake fluid bleeding the system. Ive even gone as far as exchanging the master cylinder for another one incase that one was faulty (An old book of my dads said that it should squirt fluid up on the back stroke and it was doing it on the forward stroke, the new one does it correctly). I feel like im leaving something out that I tried but its been a long week under that car. Any help/suggestions would be much appreciated. OH, there are no leaks in the system that I can find and all the rubber hoses look good.

Thanks in advance,
Mike