I have raised the humidity in my tent using a towel and a bucket of water.
put a bucket of water in the corner of tent, add water, dip towel into water and hang it above bucket.
the large area of wet towel will release more water into air. having bucket under towel will catch dripping water plus allow for easy soaking of towel.
It will raise the rh, But i having a strong exhaust will work against you...it will pull your moister out.
The fans should be circulating, not a steady blast in one direction. On stationary fans tape a piece of paper in front of fan.
With trial and error...cut to a manageable size and folding in some spots you can get the paper to flap around...which will create a random air current.