Yeah something really looks broken on this driver.
If you check the advanced settings doc: ZEN20 Power Strip Advanced Settings - Zooz Support Center
You can match up the parameter numbers to the configVals. The driver will save the values reported from the device in those state variables. So you can see what it is set at currently. Its odd that even the Overload is not matching up. **Forgot to mention this only works if the driver reports those values while the driver is active, if the settings are changed by other means the driver may not know about it
In the debug logs posted up above it looks like the driver acknowledges that it was set how OP tried to set it, but then forced it back to 0 for some reason.
Really the only way around it for now would be to set the values manually using the Basic ZWave tool, and then go back to the normal driver but DO NOT press save preferences OR configure!
You could also try my scanner tool to see if the device will respond to parameter info, and then this tool will present them in an easier to adjust way. But being an older device it may not support those commands: [RELEASE] Z-Wave Universal Device Scanner