The first place to start is as Eric suggested: eliminate your room effects bye setting near field (only 2 - 3 ft. from the front plane of the speakers. Adjust the volume to the perceived level you prefer to listen, and what you hear is, sonically, how the amps, speakers and cables are working together, at the volume levels you prefer to listen - with little to no influence from the room. If the tone, texture and balance of highs, mids and lows is what you’re looking/listening for, then you’ll know that what you have will work with optimal speaker placement and room treatment.
Listening at those higher volumes brings out the worst in a room and increases the need for dampening and other treatments to reduce the reflections and oddities that can raise such havoc with the balance, tone and musicality of a great system.
For serious listening, it would help a bunch to put a blanket in front of the TV screen and move the speakers out further from the wall and experiment from there.
Best of luck........Jim