I think you are running into the same that i described in Ecodan not modulating at negative outdoor temps?
The biggest problem seems to be that, no matter what the flow temp setpoint is, the minimum compressor frequency will be limited by the outdoor temperature. It doesnt seem like there are any settings that can be changed to work around this. This then might have more or less impact, depending on the characteristics of your house and heating system.
About the post defrost response, @gekkekoe ‘s AA solution attempts to mitigate it, but there might be a limit on how much we can “fool” the FTC.
I dont have graphs for your temp ranges, as i only started using gekkekoe’s AA couple of days ago, but here is one for colder temps. (I am still tweaking the settings)
