Personally mine sits at 50% year round, I'm lucky enough to live in a Canadian rain forest. I think the issue you're having here is that exos aren't overly great for holding humidity in, a lot of people for this reason modify them with plexiglass to retain humidity. Sitting at 50% is usually ok unless your BP is in shed, then you'd wanna raise it to like 70 ot 80 if they tend to have a hard time. Is your bowl big enough to soak in? Usually the bigger the bowl the better as it contributes to the humidity.
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