Some years ago my choice on a gusty day (no windshear) was CONF 3, after one particular approach into BRU when i landed with full lateral deflection to the left and very little control, i changed to CONF FULL (as recommended by Airbus). I've yet to experience the lack of control. It may be the spoiler logic (try looking at the spoiler deflection in the sim in CONF 3 vs CONF FULL in a gusty approach) or just the FBW being better tuned for FULL ... no idea, but it works !