Looking for wider soundstage

You probably know this, since you referred to treatments, but the soundstage often depends on keeping out confusing reflections between speakers and ears. Your TV is reflecting and your couch is absorbing. If you can put a first reflection absorber on the right (facing the system) you might find an interesting change. Use the mirror test and find the first reflection point, and during listening, put a portable panel -- there. Hide it away when you're not listening. A reasonable WAF compromise. Enjoy!

So you have your 2-channel music system and your HT system shoehorned into the same room?

As others will have observed, the speakers are too close together, the left speaker is too close to the sofa, and both speakers are too close to the wall behind them.

Your room seems to be pretty large; what's happening at the other end that is not shown in the pics?

A complete reorganization of components and furniture is the first step, even before you start experimenting with room treatments.

I have had good luck with Synergistic products because I have actually used them, so about a week ago I bought a 5 pack of their HFT [high frequency transducers] but those little guys opened up the sound stage more than the wide sound stage I had before. for years I have been using their Basic Art System[ not the expensive one] one of the cups had fallen off the wall and I didn't realize it but I couldn't figure out why sound stage had collapsed and when I put the cup back up all was good again. In my 18x25ft. room the Basic ART [d/c] the only sound treatment I used, on my speaker site I see so many using all sorts of diffusers and traps,I tried a trap once and thought it sounded good but  I decided to give the ART a try and got rid of the traps, huge improvement. I bought the HFT because on the front wall like so many others that I was throwing a heavy blanket over it which helped mostly with a depth and a few other things but it's a pain in the butt doing that every time, the HFT's apply to front wall opened up the stage even more and detail and dynamics are up too, no more blanket needed, not sure if removing the blanket or if it's the HFT's but the sound level is up from the normal level or the HFT's are creating a fuller sound stage but whatever I have to lower the volume a few notches,I have Magnepan 20.1's and the sound wave on the front wall is less so I might be hearing a more direct sound from my speakers. HFT'S are a money back guarantee and will cost a lot less then what I have seen people doing to their rooms.It's worth a try and if you don't like them send them back, if you get the results that I got you will be keep them. I have what they call level-one which treats the front wall only Level-two 5 more HFT's treat the sidewalls which I might be doing doing down the road.

motorcy can you send me a link please. Thanks. 

Not that good with a PC but here is their site SYNERGISTICRESEARCH.COM, I have been getting Synergistic products from Highland Audio in CA. The more I listen with the HFT's the more impressed with them, also at Highland the reviews that they show are real, I have posted on reviews and the do show up. With these installed you are going to want to listen to everything that you have just listen to to have to hear the improvements.