Speakers and depth...

There are a lot of things that affect percieved depth: speaker choice and design, amps, sources, placement and room.

I've got a friend who comes over and likes to toe-in my speakers for his taste but I prefer them with no toe-in because I want a laid back soundstage. I've got dipoles and that may not apply for yours.

Get the speakers the greater of half their distance to you and 4' off the wall, don't sit much farther away than it takes for the drivers to properly integrate (7' from a line drawn through the tweeters with speakers positioned in an 8' equilateral triangle works for 4' high speakers with woofers down to floor level), and get back to us.

Placement has more to do with image depth than the speakers you bought.

What amps, tubes, interconnects, speaker cables are you using? Is there anything standing between your speakers? Everything is critical when trying to recreate ambience information with a system. If that's an NAD 3020 you are referring to: SS generally does not exhibit much in the way of sound stage depth.

Keep the speakers and improve your source.

Get newer amp.Use NAD in second sytem.If you can swing Unison Unico or Pathos Classic II (both hybrids with 75 wpc+/-) or my EAR 324 with 40 watts you'd have better sound for newer speakers.Always comes down to money right?Good values in efficient speakers include Silverline and Hyperion,some like newcomer Zu.Instead of B&W 805's (I used to sell them till 2001) I'd pick Revel monitors.If going for broke stick Brit and get Harbeth.But for value look at Usher 719's,Silverline,Totem,Quad etc.Give a budget.One thing I find is a real fine room treatment (other than ASC tube traps which has low WAF) istreating wall Behind speakers with sonex tile,wood diffuser or even a rug.But as always these choices are deiced by budget and what's nearby to hear unless you want to follow us or online mags.I like 6moons choices even though they leave out some I like (There hot on Gallo's with you can get for less than $2K,have incredible wide dispersion tweeters,and decent 35Hrz bass and 20 hrz with added $1K amp).But again look for spending some bucks on companies mentioned that offer a lot for buck as mentioned above.
Cheers
Chazz