LOOKING TO IMPROVE THE ACOUSTICS OF MY LISTENING ROOM

There is no room that is acoustically correct without treatments. Rugs and drapes are not very good and could actually make your room to dead. You need a mix of absorption and diffusion. All corners will accumulate bass, this can be wall corners, soffit corners. Then there are 1st reflection points: in front of speakers on the floor, ceiling, side and the 1st reflection point for the opposite speaker.

The room is 1 of the most important pieces of an audio system

@ronboco 

I don’t believe the room was over damped at any time.

My mistake. I thought that's why you added diffusion.

If it sounds better with diffusion, what would you say has changed for the better?

@hilde45 

Actually I’m not totally sure if it’s better or just different. When you came over to listen the soundstage was well past the speakers in width  ( per a well recorded song ). Instruments were nicely separated throughout. But the music didn’t wrap around to the sides and behind like it does now. Maybe I should remove them to see which way I really like better. 

@OP Please post a photo of your room in your virtual system. It's impossible to offer any advice without seeing your room.