Acoustic question

Couple of things you can think of:

Add diffusor/absorbers to the wall on the left.  Put stand alone-diffusor panels in the empty space.  Also, don't forget to consider EQ.  If you have Roon or miniDSP you can compensate somewhat for differences.

Thanks Erik,

 I was kinda thinking of you when I asked the question. I’m to cheap for Roon, but minidsp is in the back of my mind.  I was going to start with a couple of 2’x4’ sound absorbing panels on each side and see where to go from there.
What about some sound diffuser something on the ceiling?  Will I get bang for my buck going that route?

JD

The ceiling is a highly under appreciated location for treatment, but for the side I want you to consider diffusors, especially close to the speakers

You are on the right track, try some changes with the room divider and maybe some absorbers and see how that goes. I have a dedicated listening room but it's still a room and not a laboratory, I get great sound with just a few tricks. 

I have a very similar room. I would not use absorption on the long side wall. I used diffusion and it works wonderfully. I also found I had to pull the right speaker about .5 inches closer.

Absorption is always my distant second. I find diffusion, in general,  works far better. I have used absorption in the past with a dulling effect I did not like. Even a little of it had negative unintended consequences.

Diffusion on the front and long side wall worked for me.