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!
Looking for wider soundstage
My system consists of:
parasound a21+ amp for LF
rogue st 100 dark for HF
Aurender n10
schiit Yggy dac
don sachs 2 preamp
legacy signature se speakers
Looking for wider soundstage room is not treated but it’s not bad and I have moved speakers around Thanks for any advice I have believed my amps could be better but not sure thanks in advance