IMHO, most auto-EQ systems set the centre channels to far too low a volume, and if you increase the general volume, the total volume will be way too loud.
I usually boost the centre channel about 2db above the other channels, but YMMV.
Each system has their own solution, eg the SR 7010 has a dialogue enhancer function, which essentially increases the centre channel volume.
The Denon 7200 or Marantz AV 8802 has a more sophisticated version, which only boosts the frequencies that are perceived to be in the human vocal range.
Play a familiar track, eg a dialogue heavy movie like "The Grand Hotel Budapest" and adjust accordingly.
If one shifts the position of the centre, or add Mopads, do consider doing the calibration again.