Hmm,, well,, it sounds like the shedding is just his way of releasing some of the nerves he has,, I know when my dobie gets stressed,, she can leave a pile on my carpet of her hair... (well,, not literally but you know what I mean)

As long as he is eating, doesnt lose weight or become depressed,, I wouls think its safe to say he is just a shedder and youll just have to get used to it,,,, But I am not a vet,,,, have you spoke to the vet about it? I am sure its nothing serious.....