Even after you run Audyssey, I would still Increase the Center Speaker Channel Level by 3 or 4 dB.
If the surround sound is overpowering, I would cut the Surround Speaker Channel Levels by 1 to 3 dB.
This is one reason I do not like having too many surround speakers. The CENTER is salient for dialogue, not the surround speakers. Can you imagine having 8 surround speakers?