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Being that close to boundaries is going to cause some issues no matter what you do. Any chance of getting a panel directly beside each of the front speakers to deal with the closeness and resulting SBIR?

You MIGHT be able to tweak the position and depth of a couple of the issues by working with front speaker position.

Also, you appear to have some 50hz noise (most likely a grounding issue)

Bryan
 

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I'd try to make the panel probably 75-100mm thick.

One other thing to consider. The following distances should not be the same or multiples:

Front speaker baffle to wall behind.
Center of speaker to wall beside
Ears to front wall
Ears to side wall
Ears to wall behind

Bryan
 

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From my personal experience, the 'rule of thirds' rarely works well from the perspective of smoothing bass response. It does help get you away from a wall and also give some space to the speakers though.

Try moving yourself to 62% of the room length if you can.

While 10cm isn't going to be a fix-all for the problems, it will certainly help some to minimize the constructive and destructive interference from the wall reinforcement to the direct waves.

As for getting the panels away from the wall, that can help some certainly. However, once you get the space behind the panel more than the thickness of the absorbant, you can actually start filtering as it will create a hump in absorption based on the quarter wave of the distance from the front of the absorbant to the boundary.

Bryan
 

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Just remember that quarter wave is 'optimal'. Doesn't mean it doesn't do anything below that. If you want to go deep, you just need thickness. Again, 6" with a 4" gap will go pretty low.

Bryan
 
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