i understand what you are saying now about raising the temperature to reduce the RH% .If your meter is reading out as a percentage, it’s reading relative humidity. Absolute humidity will generally be expressed as mass/volume, like grams/cubic meter. I would be surprised if that’s the case, but I get surprised daily. My gut is that it’s meter placement or just a questionable meter. I have had a few.
As a general comment, if you are struggling to keep your humidity under control in your space, you might consider elevating the temperature a couple degrees if you can without getting too far out of range. Warmer air with the same amount of moisture in it will have a lower relative humidity. Because it’s capacity to hold moisture is higher, its percentage of saturation will decrease as the air warms. I have used a few CFL‘s or other tricks to raise my temperature a couple degrees when I want to reduce my rh below what my environment wants to give me. Some times of the year, it’s just a challenge where my grow is located. If I am having any issues with humidity, I prefer it to be warmer anyway. My experience with moist and cool conditions has been very bad. A little too moist but warm and still within VPD, much better. Just my rambling two cents
would i be better off to raise the temperature in the room i get the fresh air from ?