Not necessarily. Short cycling will absolutely ruin COP, so it may actually be better to run hotter for longer periods, then turn the heat pump off for a bit while system cools a little before starting the next cycle. Overall, this could mean the same amount of heat produced for less electricity.
See Improve efficiency: Turn the heat pump off
Try raising the curve by a few degrees and see what happens.
Also, have you looked into extracting data out of the heat pump so you can have a better view of how it’s performing? Glyn wrote up how here: EmonHub support for Samsung Heatpump Monitoring via Modbus (though not as good as a proper heat monitoring package)