The phrase "solution in need of a problem" is what comes to mind.
Pogre is echoing my thoughts exactly.
The few rooms I've seen built by acoustic specialists DO NOT do any of these things you did. They give their speakers room to breathe and do what they were meant to do. They don't hide them in Cubbies and damp them to within an inch of their lives. They might have a false wall, but that is just a frame to support an AT screen. That's it. They smartly treat for echo, and possibly for some reflection. They also spend their time using knowledge and measurements, not making a Theory-Quilt to smother the sound.
It is not my intention to harsh on you.
You clearly spent a lot of time on this... but you overthought it by a mile.
We would love to help you find a way to address your concerns. Admittedly, the things you said about "plugging the ports" or other options to "redirect energy" concern me more deeply.
How can we help you?