Have you tried using some sort of noise reduction? Im not sure entirely, but if the noise is generally treated differently that what an EQ is used for. If you do have sorm sort of NR plug you can check. Then you can isolate the noise more accurately and reduce it significantly. CEP2 lets you create a noise profile for reduction purposes. Be warned that it will remove a little above and below the offending frequency and the overall content will be a little more drab afterwards.
SoMm