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While driving if you pump the brake pedal twice and hold down on the third pump does the brake pedal come up higher ?? To me most of your brake problems is the adjustment. Being and LSD drum brake system, lock the adjusters till the wheel cannot turn then back off 3 or 4 teeth of the adjuster on each wheel, when you rotate the wheels by hand you should hear a consistent scrape during a whole revolution. Brake adjustment should be made with wheels on DO NOT PUT A BAR ACROSS WHEEL STUDS UNLESS YOU WANT TO BREAK THEM OR DAMAGE THE THREADS as i seen someone recommend you do earlier.
When you bleed the brake fluid you should jack the back higher and have the side furthest away from the brake hose a bit higher, gravity bleeding gets most of the air out this way followed by pressure bleeding should see you have a great pedal.