I get exactly the same thing, mines a 2000 mile 09. It's between 4 - 5k revs and is very apparent at those revs. I've just put it down to being a characteristic of a big single ?? It seems to go alright and other than a bit of odd feeling through the bars/pegs I don't pay much attention to it.
I do get a hell of a lot of bar weave/head shake at 95 + on the motorway though, a bit disconcerting but a little bit fun as well !