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I haven't tested it, but I did read that if you exhaust more than you take in then that should lower humidity. If that's so you could try turning down the speed of the intake or increase the speed of the exhaust to correct your problem. I found this info in a old Heads mag, written by Dr. Ed. Keep in mind I have never tested it so I have no clue if it works.
I have also heard that filling a tube with perlite and blowing the air inside the growroom thru it with a fan will lower humidity, but only if your area to perlite ratio is good enough. My friend built a humidifer for his greenhouse, it isn't super hard.