I presonally don't like Conf3+tailwind combination on the A320, due to tail clearance issues. In TW conditions you carry no extra speed, so have a higher approach pitch attitude to start with. Then, since you have higher ground speed and sink rate, you need even more pitch during flare... These effects combined leave not much room for mishandling which can happen on a bad day.
So, for my personal comfort Tailwind=Conf Full, even on a long rwy....