Have you checked/tested the servo?
Servo would only make the pedal go hard not allow it to go to the floor, I suggest getting the master cylinder rechecked, nothing to say its not faulty and as a precaution have the wheel cylinders checked and calipers
Servos failing usually cause hard pedal but the can also fail by "being on all the time".
Vacuum can be fully on drawing the internals down so giving a pedal to the floor situation.
My suggestion is to test a no strip no cost test to rule out or in what it may be.
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