Have you tried tightening the clips that hold the fan against the fins?
You can slip some cardboard or anything in between the fan and the clip or the fan and the fins that would "make the fan thicker" and force the clips to hold it tighter.
is your BIOS set to run the fan at 100%? Or to control it vs vs cpu temp?
it is on 100% yes - this is only because when i turn it down I hear the vibrations instead of the airflow (airflow imo is the lesser of two evils)
The clips are quite lose at the moment, didn't even think about tightening them. Will try that when i get back see if it helps
Also thanks bensheriff - is it about the same size? and a lot quieter?