I agree with google, something is still wrong. The master cycling is designed to fully retract till it hits the snap ring retainer. At that point, you should have .060" or so clearance between the push rod and master cylinder. All cars, trucks, and everything else is set up this way.
By not letting yours return, you are blocking one of the return ports, very likely the rear half.
As a test, tighten the rear shoes up to the drums to the point the wheels are locked.
Remove your stop so the master can return to its internal stop, then try the pedal a couple of times to see if you need to pump it after it sets.
As it is now, you will likely drag the brakes and over heat them.
To adjust the floor height, trim the push rod to lower the pedal, then install a stop on the back side of the pedal so the return spring doesn't pull it to high, it still needs the required clearance (free travel).
You also MUST make sure the pedal does not hit the floor at any time, a full panic stop, two foot on the brake, should be solid without hitting the floor or carpet.
