I find personally:
A319: I haven't flown one for a few years, but I remember similar technique to the A320.
A320: After touchdown ease off back pressure, allow the nose to come down and just before the nose touches I 'blip' some back pressure to give a smooth touch down of the nose.
A321: After a smooth touchdown it needs a touch of forward pressure to prevent any pitch up with spoilers coming out, then rapidly release this back to neutral and some back stick to smoothly bring the nose down. Preventing any pitch up is especially important on this aircraft to prevent tailstrike.
I hear: A330: After mains touch a little forward pressure to land the forward MLG wheels smoothly then some back pressure as the nose comes down.