Congratulation for the esthetical aspect!
I did what you did but it was not esthetical at all...
I used cheap homemade material...
I used not only panels for diffusion/reflection/absorption panels balance ratio (homemade)..
I worked with Helmholtz resonators of various side...Their location and size tuned my room...
At the end it was stupendous...
No piece of gear at any price can match acoustics control of a system/room...
As you know yourself now...
For sure my peanuts cost room was not attractive esthetically but listening an opera with singer walking around you was enough for me...
And i learned acoustics and can do it now with experiments with any system...
Congratulation I like your room...
Acoustics learning is amazing and for me it was the experiments with many devices that was addictive...