Humidity does things different in cooler air. I have the issue. My target is 53% with a negative 5% difference.
But outside the house humidity is currently at 95%. 66% inside. It's been raining.
So no matter how much I fight it. I either heat the grow room with the hot air blowing dehumidifier. Or I let the RH% of the grow roow run a little high.
Its a walk in closet. I have my 8" on full. So circulation is covered.