Company policy is to ban Flap3 landings in the A320 but we can do them in the A321. We fly some very heavy 321s (Cat D)so I would be be reluctant to reduce the flap setting with a tail wind. The thought process is how much energy you are trying to disspate on touchdown so why hammer the reversers and brakes to save a few kilos of fuel by landing with reduced flap.The touchdown quality doesn't seem to be any different.