She's looking real nice. Mine was a meager 10" at about the same age (next run will be better!).
Depending on your local geo-spatial frame of reference 😆, you might be able to improve your RH with big increase in airflow over the plants / increase the air exchange rate in the tent; venting it outside. At least that is what I'd try to do if I didn't have the opposite problem.
GLHF and watch out for mold at those levels. 🙏
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