Hubitat in Europe (Germany) with Eurotronics Radiator Thermostats

Hello all,
I did successfully setup an Eurotronic Spirit Zigbee eTRV on hubitat using the zen driver.
My only concern / confusion is that it opens/closes the valve partially based on the temp differential between the temperature of the internal sensor and the setpoint

this is not very smart and not very useful.
I am keen to know what others have been doing with this