ObscuredVision, there are unfortunately no sides that will fit your 27" 16:9 2560x1440. Every conceivable screen combo has vastly too much PPI variance. Neither physically repositioning screens nor running non-stock resolutions will fix your current setup. It's perma-broken as-is. (~LIES, READ MY LAST POST)
Here are three recommendations to fix you up, pick one. But note that all answers are recommending PLP. Fury X supports both PLP & mixed LLL.
1. Best choice. Buy new center to line up properly with your sides. You want 32" 2560x1440 (16:9). Use in PLP form. Layout is heavy on resources, you may have unideal FPS.
For details on this layout, see source
http://plp-gaming.wikia.com/wiki/Big_He ... _Shape:2802. Cheap choice, but sucky & substandard:
As suiken says, you could drop your center's resolution to 1920x1080. You then would need to buy other sides that line up (your current sides will never line up this way):
18.5" 1366x768 (683:384), using its standard resolution, in portrait
19" 1440x900 (16:10), sides using non-stock resolution & portrait 19" 1280x800 (16:10)
20" 1680x1050 (16:10), sides using non-stock resolution & portrait 20" 1440x900 (16:10)
20" 1600x1200 (4:3), sides using non-stock resolution & portrait 20" 1280x960 (4:3)
These have acceptable PPI variance for 27" 1920x1080, & look good in PLP when center is using its stock resolution. But these sides would look terrible in mixed LLL, because now size is greatly varied. Also as suiken says, center will not look ideal, as you have increased your pixel size. Lastly, there are likely fitment notes for these if interest, on PLP wiki (to compensate any slight PPI variance, resulting in perfect perceived pixel line-up)
3. Expensive choice. Start over. Buy a preferred PLP layout that lines up. There are 60+ of these layouts. If interest ask, or just find them on PLP wiki.
(Blades of Time 2012, manual PLP)