The current place is most likely the only place for the system because there is no other places for sofa)) I uploaded two more shots to show the right wall. It's all with windows... In the morning I tried to move speakers wider, further and closer. The only positive effect if I put them wider - sound gets filled with air but bass was reduced (((absence of a rear wall). At the very beginning the speakers were standing very close to the system and sound was awful. So I found current place is optimal but fully agree with your opinion about potential opportunities of the system.
What's more I bought a rug and put it in front of the system. And more pictures on the rear wall.
Do you think bare windows in the room influence the sound?