Horning Eufrodites - help needed with boomy bass

Hi, I've seen in many pictures of the US distributors of Horning that in shows he usually locates plants behind the Eufrodites.

Before I drag huge plants into my living room, any thoughts about how this treatment can help with the issues caused by lack of distance from the back wall?

Duke, thanks for referencing Hedback Designes for me but as I live in Europe, it's awkward to adhere to such services located in the US.

Amuseb,
I think I understand your pain. I believe that everyone hears somewhat differently. I also have a set of the Eufrodites. And have tried to overcome this same feeling of unnatural bass. Sometimes production can overcome the situation (Porcupine Tree always sounded brilliant) but all else was ruined by what seemed ridiculous boom of bass. If you're still a Eufrodite owner try Stillpoints on the rest of your system. Focus on the source equipment first.
As always everyone's experience is different but for me the fix was to replace my equipment stand. It was a still point and expensive but has worked. And yes stuffing pillows and boards up the behinds of Eufrodites offers some temporary relief but OPEN them up. Let those darlin's breathe!
Good Luck

Amuseb, My Hornings are less than one foot from the rear wall. Maybe the fact that the room is huge is counteracting that. It is a large room with a 16 foot ceiling, slate floors, untreated.
Amesub, if you are using the stock plastic footers they may be contributing to the problem. The speakers benefit from greater clearance from the floor. I can suggest an alternative if you need one.