Pedal too firm after brake overhaul

[chevy72blu]

My truck sat for quite some time and was giving symptoms of a bad M/C. On the good advice from a few board members, I decided to give the system an overhaul.

I replaced the booster and master cylinder as well as the 3 rubber hoses and thoroughly bled the system (old fluid was nasty stuff). The pads and shoes were in good shape (recently replaced prior to sitting) and the wheel cylinders were not leaking or have visible issues, so I did not change them.

The truck now seems to require much more pedal pressure to stop the truck than before ie: the pedal is too firm. The booster seems to be functioning correctly (pedal falls 1/2-1" after being pumped up and then having the engine started). There are no leaks or anything visible that I can find. The truck will still lock up the front wheels just fine but it requires a great deal of pedal pressure.

The truck has front disk/rear drum and all the components I replaced are correct (which took some time to figure out on my mixed bag of parts). Reman Delco 3/4 ton 10.5" dual booster, new brake best premium (OReilly store brand) M/C, and brake best flex lines. Synthetic DOT 3 fluid.

Can a booster be bad even if the pump-up/engine on test passes?