^ What strings are you using, how long have they been in the racquet and what was the original reference tension? Does it vibrate with different types of strings?
Are you sure that you simply haven't got a faulty one? There's some background flutter if you (mis)hit the ball towards the edge of the frame outside the sweetspot but that's about it. It shouldn't 'alot' of vibration in the way that you describe.
You should also try some lead tape in the hoop. The more mass there is, the less the vibration there will be. Even a few grams will make a difference.