Looking at the latest picture you posted, personally I would move the system round and have the speakers backing on to the wall on the right of where the couch is at the moment and having your back where the TV is. You will have a more even symmetry things happening on the left and right of the speakers, yes you will have windows nearer the left speaker but still more even than the big space next to the left speaker you have now.
I will never understand why anyone would have a subwoofer near any wall? Give what I say a try, it will cost you nothing more than your time and if you don’t like it put it back. To make any system sound good, symmetry is key. At the moment you don’t have that. At the moment having a great big space next to your left speakers and sub really plays havoc with the reflection time signature of your system. You really need what is going on the left and right hand side of the speakers to be as close as possible.