Installed z-20 motor with brake, pulled “homing error” on first operation

Installation of new motor went fine and upon completion the braking worked like a “champ”. But, during the homing operation I did pull a failure “homing error” as it tried to zero the bit on the tool setter (automated step during the homing). An observation was made that the spindle was about .5 inches above the tool setter. Looks like I lost some Z travel distance. Tried a few more times and got the same error. Although the installation instructions recommended I remove the spindle, I did not have to and was able to tighten the coupler screws without spindle removal. So, the only change was the new motor. I dropped the spindle .75 inches and tested numerous times and never got the “homing error”. Now, my spindle travel is ~ 3.5 inches using a typical endmill bit (between the end of the bit and the top of waste board). See picture below. So, my question is what stops the spindle travel at ~ 70% mark (see pic), there are no other alerts in the system? Unfortunately, I never tested the old motor to see if any constraint similar existed.

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