Smoother landing could be the last thing on mind in tailwind. First because of the higher ground speed you feel closer to the ground than you are and tend to flare high. If that happens the float seems eternal and you would rather call it a day by putting it down. If you can flare little lower and little less than normal, a smooth landing is possible on the correct touch down point. On a long runway if you flare high as I said before and float then the factor C_star is talking comes into play. It depends on how much finer seat of the pant feeling you have. That is the only skill left in the airbus rest is automatic and done by computers.