Hey JT, yes wet towels helps, as MoG notes. I find from working in a small space, like yours, it’s a balancing act between heat and humidity. As the heat in the tent goes up, the humidity goes down, and vice versa. Where was the humidity before you pumped the heat up to 80+? Backing that down will definitely help also. Plants will love 75 and it will probably add 10% rh.