Brake pedal is really stiff

Brake pedal still only goes down a couple inches and it's really hard to stop because you can't keep applying pressure after that to stop quicker. You really have to mash on the brake if you want it to stop faster.

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This sounds like a restriction in the rear brake circuit:
either a collapsed hose or
debris in the proportioning valve.
When bleeding the rear brakes are you getting a good steady stream of fluid out of the bleeder or just a dribble?