Dry tent humidity really high

Run it longer and on max setting? If you ambient airs RH is high then you need to run the dehumidifier in the room the tent is in and keep the extractor on low moving the air out of the tent and sucking in the lower RH air. But if it can't handel it there is not much you can do other then getting another unit or running the AC. AC also takes out the humidity from the air. I do not use a dehumidifier, I dry inside my own tent and tell the fan to come on only when RH gets above 65%, I let em dry in that pitch black environment for 5-9 days depending when they are done. Good Luck!