Funnel,
The Airbus flight protection envelope will not (and is not designed to) prevent tailstrike. If you haul back on the stick, you will hit the tail - simple.
The A321 has the same wing as the A320 (but different flaps) and can land 10 tonnes heavier. I rarely fly the A321 but when I do I notice it is much more "solid" due to the higher wing loading. Not flying it too often does tend to focus the mind on pitch - especially at landing and the added 3 knots seems fairly common.
If a high sink rate materiallises just before touch down it is quite possible the aircraft will bounce. Unfortunately, this is also just as the spoliers are deploying (WoW switch) which causes a pitch up with the possibility of a three pointer on main wheels + tail.
I'm not sure the if the A340-600 has some protection because that is seriously long!