CAN"T get a hard pedal...need suggestions.

[BobbyK]

No Viagra jokes please.

I'v been chasing this problem since I've owned my 71 Blazer(2.5 years now).The brakes have never been good,very poor brakeing performance.

I've done the following to this point:
1-new front calipers with premium pads.
2-Rotors are within specs so I just scuffed the surface with a medium sanding disc on my drill.
3-made sure rear brake cylinders were moving freely.Lots of pad left on the shoes so I left them alone.
4-adjusted rear brakes so there is only a slight drag felt when I turned the drum by hand.
5-I adjusted the e-brake and that actually works great!
6-new brake booster(there WAS a leak in the old one).That only made the brakeing easier(less pedal effort).Didn't improve performance though.
7-new master-cylinder.bench bled it 1st before I installed it.(TSM states stock M/C provides enough pressure for 4 wheel disc.)
8-new prop. valve. (for 4 wheel disc.)
9-bled the brake system umpteen times.Pressed the pin on the prop. valve while doing this.Also bled the brakes in the proper sequence.Started from the farthest wheel and worked to the closest.
10-adjusted the rod that's inbetween the booster and the M/C.
11-checked my vacume lines and checked how much vacume I had going to the booster.All is o.k. there.
12-new stainless flex hoses(all 3 of them).

What's worse is I just converted to rear disc brakes (used the TSM kit)and now the pedal is even worse. I did adjust the rear disc e-brake and the pads are real close to the rotor.
I'll post pic's of the rear disc install on another post.
Help me,I can't figure it out!
Thanks