Very rarely have a problem with FBW A/THR - it is usually excellent* Sometimes, I am deliberately slow in retarding the levers during the flare - if I need to arrest the V/S a bit, and then the A/THR might try to increase thrust to maintain Vapp. But if it does, just bring the levers back to idle.
Airbus say that if the automatics do not provide the required response, take them out and go manual - at any time. During the flare you can easily add thrust or chop thrust if you have to.
*The A330's I flew had "lazy" A/THR on finals which you had to watch, and has been well documented.