Yeah, GB's budgies are really tame, she did a great job with Giorgio. He is such a bold and confident bird. He knows shoulders are safer than fingers and fingers are safer than palms. He doesn't like to be catched when it is not for a head scratch (when he feels like one). He still comes to me half the time.
I've done the punishment of putting back to cage for biting but and it has helped. There's been a bit of a routine change, mostly to suit him as he develops. The bathroom is now his new playroom and I can never get him to leave once he's inside. In other rooms he'll want to go where I go, except the bathroom, well with mirrors and chromed showerheads, I'm not that surprise but I really have to stop that as he's getting away with it nine out of ten times.
I think maybe it's really due to moulting that he's cranky at times. I will observe him until the full feather change, hopefully he will be gentler with me then. Now he only have two head feathers changed and no other pins at all on his body and being winter it may be a long wait.