Regarding the Ikea Poang chair, I noticed that when I took the chair out of the room, and I'm not joshing, the sound was noticeably better, more open, less congested and more natural. I suspect the foam in the chair is adversely affecting the sound. Kinda like Sonex, actually.
Listening chair suggestions
I now have a dedicated listening room and I am searching for just the right chair to place in the sweet spot. I'm considering a recliner or maybe one with an ottermen. I thought an ornate barbers chair might work but it seems difficult to transport. Suggestions are welcome.