You need to place the Confidence in the corners. It works on pressure changes and the corners are (as T said) where pressure is at a maximum.

The foam type of traps are kind of a contradiction, they work by absorption of particle vibration yet particle velocity is lowest near a boundary (where bass builds up!).

You might get some more out of what you have by placing them in the corners of the room but spaced 5-20cm or so off the wall.

I'll send you a PM.