The actual VAPP value is calculated as follows:
Assuming the tower reported steady state wind is entered into the MCDU APPR page.
VAPP = VLS plus 1/3 of the tower headwind component. The value of VAPP is limited so that it is never less than VLS + 5 or more than VLS +15.
As a result, VAPP is increased above its minimum value for runway headwinds above 15 knots. VAPP correction is not increased further for headwinds exceeding 45 knots.
The groundspeed mini function does not change VAPP, instead, it increases the target (bug) speed when the headwind is greater than the expected landing headwind - the wind that VAPP was based on. This is done so that if this greater headwind disappeared all at once (windshear), the airplane would be at VAPP not VAPP minus the loss of wind.
Tomorrow we will see what happens when we initiate a go-around.
Enjoy the journey!