Drifter, J.B. uses the Audyssey "Flat" setting since he wants a level treble setting. If you're not doing so already, you should use the "Audyssey" setting rather than "Flat", since the Audyssey setting applies a gentle 2dB per octave roll-off above about 4KHz to help tame program material with excessive treble content.
Also, the manual equalization option can't be used to "tweak" the Audyssey room equalization results. It's either Audyssey or what Dr. Kyriakakis has referred to as the "crude" manual equalizer, but not both.
