Looking for wider soundstage

Build the Linkwitz LX521 system and you'll have your "forever loudspeaker."   If you can't do the woodworking, then go to a local cabinet maker to have them make it up for you.  It's a simple kit.  The driver kit, pla ns, and necessary active crossover are about $3000.

The San Francisco Audiophile Society had a listening session with the LX521 last year which was well attended.  More than one person in attendance decided right then and there to make the move to the LX521.

Madisound also sells flatpak cabinet kits too, but they're about $1000.   You might very well be able to find a local cabinet maker who could knock them out for you at that price.

The thing which will most determine your eventual system price will be your choice of amplification.  You could fabricate your own multi-channel amp from Class D modules you get from Parts-Express, or you could source the needed 10 channels in some other way.  There are a lot of good "zone" amps on the used market.

designsfx I would very much appreciate your thoughts on speaker placement dimensions if I were to move them to the opposite side of the room. Thank you. 

I would try draping a light plastic painters sheet/tarp over the sofa to the left and also over the HT speaker to the right (maybe both of the HT speakers).

Both the sofa and the drivers in the HT speakers are absorbing sound.

DeKay

Open baffle speakers provide the greatest soundstage. Simple is best. 

@backdoor , I had a look at your pictures and I hate to bring you bad news but even with digital signal processing you are never going to get a decent image with your system as it is set up. It breaks almost every tenant you can imagine. It is fine for everyone's background music pleasure but that is about it. Your system needs a home that is more in keeping with it's intent. No amount of room treatment and expense is going to change this. Your next mission is to find a more appropriate home for it either in your house or eventually another if it is that important to you.