I have had 4 plants in the Grobo that have all suffered from some form of dampening off. Sometimes the pod felt dry to the touch other times it felt wet, just study the plant and “listen” to what she is telling you. Plants are great, they give us warning signals before they die but we need to know how to translate. I am still learning, so much to learn.
You are right, humidity is just fine but trust me, a fan circulating the air will make your plant happy. I have 1 fan that I run from the start, no direct airflow on little plants but once they have a couple inches, they are ready for more air. Once the plant hits late veg I add a second fan to ensure buds don’t get too much moisture and the entire plant is receiving air flow.