they make the holes on top bigger now i think because mine never creaked before and now it does on my new pro using the same bolts, but i just put some grease in between the headtube and the mech and it is silent now :]
and dont just tighten it as hard as you can, i snapped part of my brand new pro mech behind the back bolt by tightening it too much trying to get the creaking to stop.
sometimes its the headset. watch out for that bc when i had a stock headset i thought it was my folding mech creeking when it was my headset. just tighten and secure everything