Am I correct to believe that the autoformer should not add to park power that is acceptable. In other words the autoformer stays off until the power drops to a dangerous level
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The Autoformer doesn't 'stay off', it just automatically varies the boost. IIRC it will boost up to 10% when park voltage is low, but once the input is at 118 volts the Autoformer drops to a minimum increase of about 2%.
So if you have park voltage over 118 volts, add 2% to that number and that is what you should see on the output of the Autoformer. What your progressive EMS reads inside depends on the accuracy level of the EMS and whatever you are comparing it to.