Try moving each one in 8 inches.
I’ve moved them from about touching to 30" from the front wall in 2" steps. I’ve moved them closer together. Further apart. On a different wall.
The closer to the front wall the more boomy the bass gets but while there is more midbass its woody and muddy sounding.
I literally cannot think of a place shy of the bathroom where they haven’t been. I mean that seriously.