I've got a hump in my mesh but the deviation isn't that big (.18). When I use a straightedge and a flashlight I'm able to see light on the edges so am wondering if this is just "how it is" for this bed or if there's more I can do. I've verified as well as I'm able that everything is square and I've also loosened up the x-rail bolts (a torque wrench is arriving tomorrow so I can verify 0.98Nm) but so far can't seem to get it any better than this. Any ideas? I'm not (really) complaining as I can work with sub 0.2 but was just hoping for better.