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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Elliot, when I read about the remote controller, I don't see anything about balance. Otherwise, I'm intrigued.
Elliot. Never mind. I found a close-up of the remote and there was the balance control, allaying my insecurity. Do you know this will work with my system? I'd like to get one if it does.
Details: Deezer and Qobuz to Mac to Audioengine D2 DAC via USB to wireless D2 receiver to MFA308 integrated amp via RCA to ATCs. Where would it go in that chain? Do I have the right inputs, etc? Remember, I'm an idiot who needs basic instruction.
It definitely has remote balance, you can read the specs on the box in this listing. I forgot, remote mute is also often handy.

https://www.ebay.com/itm/Chase-Remote-Line-Controller-RLC-1-NOS/293767588499?hash=item4465e9aa93:g:z...

he does not take returns, I would not buy from him, which is why I gave you the other link.

btw, It has two identical set of outputs. I used to compare two different systems using that, no more. They say 'front' 'rear', because it came from early days of people messing around. It was sometimes put into a tape loop, I just run everything thru it.

Remember, there is no center, it is Phantom, and you control it's location (within reason) by equal or unequal volume from l/r. Bass player on the left of center can only be done by mixing more from left, but some from right
I'm sorry to keep bugging you, but... I'm still unclear where it goes in the system. Right before the amp as a preamp? So I'd plug-in my receiver D2 to it and then output from it into the amp?