Audyssey/auto calibration setup crossed your surrounds to high. What are the trim levels set for your speakers?
You should try disabling audyssey and crossing your mains at 80hz, centre channels to 80hz, QS8's to 80hz or 90hz and your QS4's to 90hz or 100hz. Adjust the sub (using the subwoofers volume control in accordance to the +2 setting on your receiver) to your liking and double check your speakers trim levels, speakers set to small etc and play some material through these settings and hear if there is a difference to your liking. Just remember to disable audyssey before doing all this.
