My 2011 +4 with 48k miles, also has similar…a very slight resonance/vibe at around 3000 revs, felt through steering wheel and disappears as revs increase by a couple of hundred. Feel it more than hear it.
My old Triumph Trophy motorcycle also used to show a similar characteristic at about 3500 rpm, though that was a triple with balancer shaft.
Nothing to worry about but as others have said, worth checking tightness and rubbing.
