Just like to throw in a tip here:
As a gamer, the computer is not really struggling with noise until I'm in the middle of playing. So I recommend recording your "noise profile" at the end of the track, not at the front. It means the sound of your external HDD spinning and your computer fans working overtime are included in your ambient noise profile.
Also, I normally run a dynamic compressor before noise removal, as it picks up some of the quieter sounds I'm making before cancelling out ambience. Prevents my turning into an android.