Looking for wider soundstage

@ backdoor-

I know it may seem counter intuitive but have you considered rotating the "audio" components of your system to the shorter wall where the display is currently located? (Assuming that I'm understanding the dimensions you provided). 

@backdoor 

I believe it would help as it will change the relationship between your speakers and the room boundaries. It's easy enough to test without moving everything by temping in longer speaker wire and just moving the speakers. If it seems to improve then you can plan a more detailed placement. If you'd like to try it I can pm you starting placement dimensions.