Question is answered.😎
Anyway, documented hermie so ask for a refund? 😅 I would be interested in the result 😆
On the other hand, are you serious with 20% RH? I am not sure this would be in the measurement range of my instruments (at least with acceptable variation). Would double check with another measurement.
I don't know your environment, but as you are indoor you have indeed options.
First: Passive + Active air regulation
Second: Bucket of water, wet cloth and so on in your tent
Third: Wet Cloth or something in front of your air inlet.
If normal measurements can't help, I just throw in a bucket of water in my tent (of course with a tub below your pots+height adjustment).
I don't have experience in other climate regions, but I can't imagine the usefullness of a humidifier which actually needs power and blows raw water around in my tent with electronic (and senesitive) devices. Well, never tried.. so just an assumption😘
Best wishes for success next time 💪