914nut - here are a few things you may or may not have tried that should improve the imaging of your Sound Labs:
Try them on cones. I use Walker Valid Points, stuck in their little lead hockey pucks. I have a customer who uses Blue Diamond Racing cones (the "detail" ones) on a hard tile floor with good results. When you are standing the speakers back up, having screwed on the cones, take care not to put all the weight on a single cone. Rotate the speakers to one side a bit as you stand them up so the weight is distributed.
Address the first sidewall and "frontwall" reflections. I use fake ficus trees at the first reflection points to either side of the speakers, as well as behind (and a bit to the inside of) the speakers. If your room is bright and underdamped, consider a date with Sallie.
Put a pointy piece of tape on the floor exactly in front of your listening position (pointy so you can get an exact measurement), and using a tape measure make sure you have both speakers exactly the same distance from the point. You may end up making small, 1/16th inch adjustments by ear. Roger Waters' "Amused to Death" is useful for getting this part right.
Make sure you have both speakers toed in the exact same amount. I suggest using a flashlight held to your forehead, and adjust the panels until you see exactly the same reflection in each.
If you have done everything very meticulously and the center vocalist is still a bit off-center, try gingerly using the bias controls as level controls to dial that vocalist in to dead center.
I find speaker cabling to make a significant difference in the soundstaging as well. You want a very coherent cable, one that minimizes time smear. Since the Sound Labs are inherently very coherent, timing anomalies that go unnoticed on other speakers ought to be addressed. The wide, flat Magnan Signature cables are my personal favorite. Note that David Magnan's reference system is a pair of stacked Original Quads - conceptually rather similar to the Sound Labs.
You might want to get several bags of lead shot and put them on top of the speakers. I put each bag inside two thick, dark socks, (the opening of the inner sock oriented opposite to opening of outer sock). I use number six shot. You might also want to experiment with solid lead blocks on top of the speakers. I think this would work even better.
Someone above was wondering if the Sound Lab dealer in New Orleans offers a discount. My reply:
"MUUAAAH HA HA HA HA!"
Sorry, I've been wanting to do that for a long time.
My gimmick is, if you travel to New Orleans for an audition, you stay free in a bed & breakfast I manage, and I'll reimburse up to $500 of your airfare with purchase. I offer a modest discount in addition to the airfare thing, but I'm not trying to be the internet discount king. I'm trying to be a real dealer regardless of where my customers live - my shipping crates are available to my customers, for example, and if you have a problem I'll do my best to get it resolved quickly and to your complete satisfaction. Blah, blah.
