Before I go,don't be surprised when your new daughter grows to despise you for physically abusing her as a way of discipline.
Not starting drama, making a valid comment/statement called the truth.You should try it sometime.
A 30 years old man spanking a little kid who has no clue how the world works just because they did something wrong is immoral in my opinion. Try to not traumatize that kid too much. And you feel proud? Doesn't matter if it was 4 times or not, that kid will remember that for the rest of his life. And like Fab said in another thread, what do you wanna accomplish by spanking him?