I hope he enjoys the spray. Timber sure does, but I have read here that not all do. Glad to hear he isn't growling as much, which is probably a sign he is "getting used to" his new environment. It sounds like he just needs time. Have you tried sitting close to the cage and just reading to him or anything? I know I've seen that suggested here. They feel safer in the cage, which is why he goes to the furthest corner. With Timber, my interactions with him started through the bars. He wasn't as fearful of my hands with the bars between us. I'd just touch his beak or feet and talk softly to him so he would get used to my hands and know I wasn't going to hurt him.