The mechanics of what works consistently changes depending on the day. Maybe you crossed the threshold and got a gust of wind briefly increasing your airspeed, or maybe the opposite happened and you’re a bit slow. It difficult to say mechanically what to do other than whatever is required to arrest the rate of descent and then allow the plane to settle on the ground. In the real A320 the flare mode is designed to have you holding back pressure on the stick because that is what feels natural. How much you hold depends on what is happening. I don’t know if the Fenix A320 has modelled the flight control laws in that much detail.