Ideally for a heat pump all emitters should have the same flow temperature and there should be no zoning. Typically UFH is downstairs only, or maybe downstairs in an extension only. The radiators are for the rest of the house.
Given that heat rises only a relatively small surface area of radiator is needed upstairs but any downstairs rooms without UFH need large radiators to heat both the room they are in and to a lesser extent the one above.
Also, ideally there should be no TRVs to restrict flow. Instead of restricting flow reduce the flow temperature. In my own house I have eTRVs and radiators throughout. All thermostats are set to 30°C, i.e. always open, except bedrooms. This ensures a regular flow. There are no room thermostats to switch the heating on and off as this is extremely wasteful. Instead I use weather compensation to adjust flow temperature.
I just use the output from the eTRVs to monitor room temperatures.
See also my thread on starting off with a Daikin heat pump.