I really think you
need more separation between those two boxes.
Can you re-orient your system within that room ( iow; point the speakers a different direction and gain some separation ) ?
I've found that a reasonable measured distance between the horn throats is 6ft ( 1.83 Metres ) when wanting to achieve decent imaging in a tight room.
When speakers are that close to walls ( as yours are ) one really wants to control ( with some sound absorption ) the first reflection points ( found immediately to the speakers on the side walls for a couple of feet ).