Did you make sure Dynamic EQ (DEQ) is turned on and Dynamic Volume is turned off ?
Because plain Audyssey or Audyssey Flat does utterly nothing for me either -- unless DEQ is turned on.
For years I would imprudently automatically turn off DEQ and thus was never able to see any benefits whatsoever for movies and music.
But now, both 2Ch music and 2Ch/5Ch movies absolutely benefit from DEQ for me.
So turn dynamic volume off, Audyssey to Flat, and turn DEQ to on (if it is turned off).