what kills soundstage depth?

Easy - now you have posted photos - the speakers are too far apart. If you want
depth then get them closer together - the way you have them is too much like
headphones (think headphones put the depth flat - sounds in your head). Each
ear must be able to hear BOTH speakers directly (and the funny flab of skin
around your ear plays a big role here and performs best with sounds from in
front rather than to the side)

even though recordings play the biggest role, you might try playing with speaker placement. you have a nice system.

Shadorne -
That is EXACTLY what they sound like! Big headphones. I set the triangle up with each side being the same length. But I will try less distance between the speakers. Or I could move my chair back. Should that accomplish the same thing?

Jimmy,

The equilateral triangle is most useful for mixing or mastering. If you want a more 'realistic' presentation then I prefer speakers facing forward (not toed in) and about 2 feet apart for 3 foot listening, 4 feet apart for 6 foot back listening, and 8 feet apart for 12 foot back listening. The further back the more natural and less like headphones it will sound - however you need correspondingly bigger space as you need at least 6 feet open space behind the listener and if you place speakers 8 feet apart then you need a room that is at least 16 feet wide.

Whatever you do DO NOT sit with your head or couch up against a wall - this is the single worst thing you can do in any listening room - if you cannot hear the damage done to audio from sitting at a wall then you probably need not waste money on audio gear. I see that you have a seat closer to the middle of he room than your couch - I assume you hear the degradation from sitting at the couch and use this seat for critical listening?

Shadorne-
Yes. That is what the rocking chair is for. Came to the same conclusion on that issue.$15 garage sale rocking chair has been biggest improvement so far. At some point I might get a more comfortable low back chair that is spouse approved but this works for now.
I will play with your ratios and see what happens.
Thx!