If you would share the entire setting and placement of your system then I could give you some suggestions, furthermore, the speakers, if you say so, do sound good, then it is fine, but still you need to compare, have you tried JBL speakers? Polk Audio? any high end company similarly? then I would say do check them, they sound all the way different then the old school Pioneers, Sony, Yamaha, Onkyo and Denon, Japanese speakers are good but they cannot be compared with USA's UK's, Denmark's speakers. I am missing the details of sound in every speaker I have, after the Polks tower went Abbotabad
One very important thing, do not buy stuff from the markets, if you need, I can give you many contacts who are the real audiophiles and they demand very good prices.
The changes in position can give you difference of sound as well. Let me know if we can contact over the phone.