Seems your doing pretty well so far. Two weeks isn't long enough enough to know his true personality though. There is what is referred to as the"honey moon" period where the bird is on his/her best behavior until they figure out what they can get away with. So his personality may or may not change. As you've had a large parrot before, you likely know how to read their body language and that people teach parrots bad behavior.
He is eating well and the vet exam will be a good thing.
Cockatoos are very intelligent and their abilities to get into trouble should not be underestimated. If you have a specific question feel free to ask.