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I flashed the firmware with the Z acceleration changed to 40, but I still have the occasional buzzing problem. My X rollers are still out of sync too. I made a video:
https://www.youtube.com/watch?v=pHfM3th7Py4 on most of it you can see the X roller on the right side is moving more freely than on the left, so the axis is just kind of swinging back and forth. Toward the end there are two instances of the Z control doing the buzz/grind thing.
I did notice that after I had connected and moved the rollers a bit using RepetierHost (so the motors are energized or whatever), I’m able to move the left-hand X roller pretty easily, while all others resist being moved. Does that shed any light on the problem?