@phaedrux
I don't see anything under move.compensation that appears to be maximum deviation value, there are RMS and Mean deviations though
But I do see move.compensation.meshDeviation which I'm guessing is an array that I could probably just parse for min/max
edit
I was looking at the online documentation, after booting up my printer and looking at the DWC plugin, move.compensation.meshDeviation is an object
My min mesh value is -.112 and max is .001 according to the height map viewer. I don't see any corresponding values in the object browser