Further on better handling with Flap full, if you go through BEA report on Armavia A320 Sochi fatal accident there is a note which says:
Note: In the course of experiments on the simulator undertaken in Toulouse, it was determined that when the aircraft is in landing configuration, the turn coordination function works with rather significant errors. The Airbus representatives admitted this and explained that this aircraft type was not intended for manoeuvring with high bank angles in the landing configuration.
FCTM
LANDING
Ident.:
PR-NP-SP-10-10-2-00020711.0001001 / 22 MAR 17
Applicable to: ALL
Configuration FULL, or 3, can be used.
CONF FULL provides better handling capability in turbulent conditions, however, CONF 3 provides
more energy and less drag.