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I don't know the proper word in English to describe what I mean. If you have a Papst 120mm at 12v and stop the fan with a finger, then when you remove it the fan will immidiately spin to full speed. Having the Papst on 5v og 7v it can barely start again after this action. In my experience it looses power that affects the performance when mounted on a radiator - don't know why, but I guess it's because of lowered (back?)pressure wich results in worse heattransfer from copper to air.
At that point the Enermax have "full throttle" at all RPM speeds in the variable area.
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It's because the motor of the PAPST doesn't have enough torque to overcome the polar magnets when it's run much below 7v. Nothing to do with backpressure etc, just not enough power for the motor to overcome magnetic force. Bigger blade requires more torque to move it from pole to pole. Better to find the correct 120mm fan.... which the PAPST obviously isn't for your purposes.