It's definitely improvement with all of them. Does it fix the entire problem....I don't think so!
Just correction, my room is 8 high x 16 wide (second half 19') and 32' long!
The big 3 units (right after my component stand) should work more like difusers for lower frequencies and they are two chambers units. The rear chamber (wall side) is a membrane bass trap.
I also have 3 big DIY corner bass traps from Owens Corning rigid fiberglass one foot tick and 3'x6-8'. (only 3 because I have my bar in the fourth corner).
I had them in the frame with just a cloth over:
Than I covered them with "reflective" surface, so they don't absorb much highs. My floor is now all tick carpet and I have a lot of difusers so I don't need another high-suckers!
Now they look like this:
