You could try decreasing FOV.
This is what I had to do on my triple screen arrangment. I decreased the FOV slider right down to 0. It's still not ideal, but a lot better. The other option I'm personally considering is a single 21:9 monitor with less width, as that would likely be a better visual balance.
Despite zeroing my FOV this distortion is driving me away from a 3 screen setup to either the Dell Curved 34" Monitor (Dell U3415W) or the Phillips 40" Monitor (Philips BDM4065UC). Plus i miss out on SweetFX (Thats proably possible across 3 screens, but i have tried and failed), The in-game Trading extension, (Again possible to setup for clever ies, but i failed good and proper), and when i take screen shots they are like a Panorama shots.......So it's bye bye 3 screen and hello Dell or Phillips.
I have the philips 40" and its a beast of a monitor, fantastic for ED (and pretty much everything else) but you will still get distortion at wide FOV settings for the reasons I mentioned above.
The distortion occurs because of the separation between the view point assumed by the rendering algorithms and where your eyes are actually located, the redering view point is generally much closer to your screen(s) that most people actually sit. It get more noticeable the wider the FOV so you notice it more with multiple monitors because your FOV is effectively increased, and the apparent distortion is actually made worse by the fact that most people angle the side monitors in to some degree. If you have a single super wide physical monitor you would still get the same effect.
So......would you recommend the Phillips as a gaming Monitor (Especially ED!)? I am worried not about the actual size of the Monitor as my desk station will easily take the size, but worried about sitting to close and not seeing a Sharp Picture. I currently sit about 25" to 30" away from my triple setup (Sorry i am to old to give you that in this modern cm stuff)