I think - you've only had him a week, he's had a few changes in his cage and it'll probably be another couple of weeks without changes before he gets into a routine and relaxes a bit. They do groom a lot sometimes - I worried about this when we first had Charlie. They can also groom more when a bit stressed. I shouldn't worry just now. As for scratching - this is Charlie having a normal groom - lots of ear scratching there!
https://www.youtube.com/watch?v=aZlOEHJaF18