Besides trying different speaker positions, consider having your room acoustically treated by a professional. Chances are, if the Focal dealer was using $100K of electronics to demo the speakers, I'd suspect they had also put a lot of effort in the the room's acoustic design. That has a major impact on stereo imaging. As others have noted, early room reflections can smear the image of even the best speakers.
The only problem for many audiophiles is they do not have a dedicated listening room, but have their setup in a living room or other spot in the house that has to share duties with other family activities. While that typically limits what can be acoustically done to the room, that doesn't mean there can't be improvements. That's where someone with experience in this area can be very useful.