GreenSoul_ZA

I live on an island and have the same issue. People say it can’t be 100% humidity without rain. I invite you to Nantucket. I try my best to control my lung room ( room where your tent is)with a big dehumidifier. That way in can bring the RH down and not loose too much space in the tent.

get some humidity absorbers , they go for 5-10 bucks each wont decrease by much , but at least it will absorb some of it . using two of them in my 70x70 tent . one under plants one above

You can raise the temperature. VPD for 70% would be 78 degrees if I'm reading the chart correctly. https://pulsegrow.com/blogs/learn/vpd-charts-in-fahrenheit-and-celsius-with-leaf-temperature