D.000 partial load autoA pump head of 1.97M will give 53% of the flowrate at 7M so would expect the rad(s) dT to double, your original dT was 4C? (47-43), so might have expected a bit more than 2C increase but rads with flow/return of 47/43C at a room temp of 20C, makes them 25deg rads which will only emit, (25/50)^1.3, 41% of that of their full 50 deg rating. Can you look at D.005, D.006, D.040 & D.041. Will find a few more parameters to look up later.
Also check D.00 & D.071
D.005 heating target flow temp 51
D.006 outlet tempreture target 50
D.040 flow tempreture actual value 50
D.041 return tempreture actual value 34
D.071 max heating target flow temp 75