m0useanswered grow question a month ago Some more details would be helpful or a diary or images.
Air flow is good, it helps the plants breath and prevent mold.
You might need to run the exaust fan at a higher speed or run a dehumidifer in the room where the tent pulls its air from.
If the tents RH is 70% and the ambient room its pulling from is 60%. the RH will never drop below 60% as that's the normal. so treat the room and lower it if you need lower. or just keep up the airflow and hope for the best.