what kills soundstage depth?

Your hunchs are spot on. Get your speakers away from walls, try to keep area between and behind speakers clear, ie. low equipment racks, no big screen tvs. Treat first reflection points on side walls with absorption, I use diffusion at first reflection point on ceiling. Your equipment should do depth.

XLO/Reference Recordings Test Disc has some good tracks for image analysis, some of the Stereophile Test Discs also have tracks for this.

Thanks guys. I will get a picture up of my system set up on my page.
Yall are gonna laugh... It has to double as an ht set up so I may be out of luck.
Thanks for looking. Will have picture up soon.

Speaker placement. Without question.

Away from the back wall and side walls. Try them closer than you have them presently. Experiment with toe-in.

There are many resources for suggestions. Google "speaker placement guide" and you will get a list of links to useful alternatives.

Sorry for any confusion caused, but I accidentially posted supplemental comments on your system thread with the photos.

add tube? tube is known to improve soundstage depth