Once the oil reaches 160°, begin frying your first batch as follows.
Dip each chicken piece in the batter and then briefly let excess batter drip off.
Carefully lower the pieces into the oil individually. Do this in quick succession so they're fried for roughly the same amount of time.
Keep the batch small enough to ensure the pieces don't touch each other or the sides of the pot. My pot (see pictures) fits about 3 pieces.
Don't touch the chicken for the first minute to avoid breaking the batter. It's usually enough to flip each piece once half-way through. This ensures even browning, as the heat is higher underneath.
Measure the temperature often and keep it between 160° and 165° to the best of your abilities. The oil cools down when chicken is added, but if you keep the heat high at all times, it may overshoot the desired temperature.
After 6 minutes, your chicken should be lightly golden and fairly crispy.
Take out each piece and carefully shake off excess oil for a few seconds.
Store the pieces on a wire rack and/or on paper towels. Flip them once before the second fry to get the oil out from all sides.
Using a fine mesh, remove any bits of dough left behind in the oil.
Bring the oil to 160° C again and repeat with the remaining batches of chicken.