jep they have a potential to rise the rh. have a dehumi too if the outside environment becomes too unfriendly. Good airflow is essential.
I also thought about somehow putting a ceiling over them, but i guess if that's not well aereated it will do more harm than good.
Good luck, looks well. And remember they can't feed what isn't in there - better overshoot than be greedy with nutes.
Cheers!