At FL350, TAS 280 you are going to have an IAS of just less than 160. This is likely to mean a full stall, as such your bank angle is likely to be the last of your worries.
Anyhow, for a given turn ELAC will start the turn with aileron, along with SEC with a touch of spoiler. The ELAC will keep the turn level by adjusting the elevators to maintain your flight path and the FAC will balance the turn with rudder.
Normal turns at low levels occur at 25 degrees AoB.