Quote from CONF_iture:
"But Roll Normal is not fully active before 2 sec after attitude is over 8 deg. Until that time the roll is still under Ground Mode when aileron deflection is proportional to Sidestick deflection. As you state, pilot's action is necessary to prevent the upwind wing to rise during rotation."
Bien-sure, although I certainly could not confirm that your precise figures (2 seconds after Pitch +8) are the same for the A320, and my FCOM is way out of date. I think the most likely time for the wing to rise is when the wing starts to "fly", but the main wheels are still providing directional stability. At that stage, the a/c is still, in effect, side-slipping in the crosswind, and roll control is still stick-to-aileron/spoiler.
My own practice was to retain the original aileron after 100 knots, and be prepared to increase it (if necessary) during rotation until Roll Normal law kicked in. Better to have a brief extension of the spoilers during rotation, than for the a/c to roll downwind.