For the device settings you could use my scanner tool as well, it will scan the device for all settings and present them to you to be changed: [RELEASE] Z-Wave Universal Device Scanner
For the scale of the readings, you could try my ZEN04 Driver (which also works as a universal power meter plug driver): [DRIVER] Zooz Smart Plugs Advanced (ZEN04, ZEN05, ZEN14, ZEN15, ZEN20, ZEN25)
If you try my driver enable debug logging and see what you get when the reports come in. I have a specially crafted debug log that is easy to understand which shows the exact values and precision the device is reporting.
