Uneven soundstage help, please.


I've got a pair of ATC SCM40 v2's driven by a Musical Fidelity A308 (plenty of power) and overall I'm happy with this combination, given my budget, wife, and listening habits. My system is in an incredibly complex large room, with all sorts of variables in terms of reflection, absorption, etc. And these aren't exactly the same from one speaker to another. I have no choice about speaker placement, given the room configuration.
There's a phenomenon that concerns me, though, that I haven't been able to resolve. In order to get the center centered, I need to position the speakers and listening chair in such a way that the soundstage extends all the way to one speaker, but only three-quarters of the way to the other. It doesn't sound out of whack. It's just a narrower field than I had with my older KEF References, and I wonder if it would sound even better if this was resolved.
Has anyone else faced and solved this? What factors are driving it? I've been living with it comfortably, but I wonder.
Thanks ahead of time for any replies.
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Maybe I missed it.  When you reversed the speakers L/R (or the speaker connections), there was no difference, correct?
Get hearing aids if you need them!!! It's really much smarter than trying to tune your system to accommodate your specific hearing requirements. I don't understand why people are so reluctant to do the one thing that will solve the problem most elegantly and simply.
Yeah, switching speaker connects didn't change things, and a DB reading said they're the same in volume.
Hearing aids, huh? You youngsters...
I probably wasn't clear earlier, but I'm happy now that I repositioned things--an obvious improvement.