Hi, welcome to the board. We have a Nominate Greater Sulpher Crest, your Eleanora is similar in size but I have never heard much mentioned about differences in the two. Ours will be 6 in March. She was bought as a one year old chick. I can tell you that it took almost 2 full years before she accepted my wife. She doesn't bite me, much! Now they have a good relationship but I am gone a lot and I think Baby figured out that she eats better if she's good to her Mom!
Personally, I think you are doing quite well. You mention other birds so you know a thing or two about them. You have only had the bird a month and have made progess. These birds take time. I do think that too many 'Too owners try to actually have their 'Too on their bodies too much. We don't "cuddle" much except to transport from one place to another and feather preening around the neck and head.
If I were you, I would just go with the flow and let time work. You do have to establish your "higher" place in the flock however. You can't be showing much fear. Maybe don't use your hands as much. Wrap your arm in an Ace bandage or towel under a long sleeve shirt and present your arm. Once he realises that you're not worried about bites, he may give up on the testing.
Go up to the search engine and type in 'biting" and "aggression" and read other people advice and experiences. At any rate, welcome and let us know how things go.