Seeing is believing, I think you may want to try using something like REW to find out what YPAO to you mid range.
As an example, here's my listening window average that shows the effects of Audyssey, you can see there is no effects in the mid range as I limited it to 600 Hz (might have been 1000 Hz, don't remember for sure).
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I just ran another one this morning, below is the FR right after Audyssey run was completed, no manual tweaking whatsoever, just as found FR.
And I think ADTG must have a near perfect room for him not to hear a difference, here's mine.
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