Why is everyone skipping over this is a dipole 1 foot away from the wall behind them? I dont care how long you burn them in, what treatment you use, the cables, the preamp- NOTHING will fix that "dipole close to the wall behind them" problem.
If the dealer told you this would work, definitely return them and say it was terrible advice. Don’t shop there anymore if they really said that. If you wanted it and they said nothing because you were determined, I’d give them the benefit they didnt understand your room conditions. But if you explained this room in detail and they understood you were seting them up 1 foot away from a wall behind them, they shoudl never be trusted again. If they try to sell you something else to "fix" it, just run the other direction. This problem is super simple audio 101. Dipoles are advanced math products that require a good understanding of acoustics to properly set up. Otherwise you need pure luck or a deaf client.
To test what I am saying, try a little demo of your own. Divide your room in thirds wall to wall. Pull the speakers out to the first (third) point, dont change the distance to the side walls from where they are now. Then put a listening chair at the next third point. Now the room is divided into three, the speakers and the listening position split the room into three parts. NOW listen- completely different right? This is how you know for sure its the room and speaker position. If the room is also highly reflective (hard surfaces everywhere, no absorption), it will make the problem worse and changing the speaker position will have have less of benefit. Dipoles in highly reflective rooms is acoustically a no no unless you have a acoustic consultant figuring it out and building the room specific to a dipole. Dipoles can sound good in large rooms that are not highly eflective.
