CCS/IWR6843ISK: Accuracy error of the Difference between Real distance and min/max parameters of Vital Sign project IWR6843

Tool/software: Code Composer Studio

we had measured the visibility of vitalsign in parameter min/max (vitalSignsCfg 0.0 0.5 256 512 4 0.1 0.05 100000 300000)

It shows bigger difference as the distance is further.

Can you guide us how to make it easily adjustable per distance? Our coverage  for the distance from 0.2 to 5 meter.

BR,