I have also been running into the same issues as you, the good news is the Matrox Software still works for maximizing windows to the current monitor...
Follow the link in my sig to see how I have got my Windows desktop in Surround mode to work well enough that I never need to change back to non-surround mode. I imagine Nvidia will have to come out with a version of their nView software that does what the Matrox Desktop software does.
I also like how the monitors blank or go black with backlight on when I am in 1680x1050, I used to have to flick a power strip off that I had the left and right connected to for single monitor gaming...
Overall Surround gaming has been near flawless, installed Battlefield Bad Company 2, cranked up to High Detail, and just been walking around noticing the DX11 HBAO (Horizon Based Ambient Occlusion) weather, shadow, sunlight, and wind effects, they are impressive in triplewide.
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Core i7-8086K @ 5.0 Ghz | H60 | Nvidia GTX 980 Ti 6GB | Soundblaster Z | Asus Z370-A
16GB DDR4 | Win10 x64 | 3x27" Asus IPS @ 5760x1080 | Samsung 970 1TB NVMe
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