Looks like a really nice setup, just a shame you aren't using the other boxes/screens.

Maybe the reason you find them hard to use is that you seem to be sat really close to them? I have my KB on a shelf that pulls out from the desk, and find the ideal distance from the front edge of the KB back to the central monitor to be about 800-850mm (almost 3ft). Any closer than that starts to hurt my eyes after a while