Over powered rooms with booming muddy midbass is quite common. IMHO, a subwoofer is best when used literally as intended....to augment the lower octave(s) and pickup where the main woofer’s output is weak A sub sounds best to me when it’s not featured. I set the low pass sub filter at it’s lowest setting, and set the gain so that it’s barely noticeable except on bass heavy passages. The sub shouldn’t be active when there’s no signal in the bottom octave or two.
Did you ever buy too much bass?
I talk a lot about bass and integration of subwoofers in a system and I realized that I need to hear more about the experiences auidphiles have when they go buy speakers and put them in a room. Did you look at specs? Did you audition in the home? Did you end up with too little or too much bass compared to what you were expecting??