You shouldn't have to spray the T8. The humidity should stabilize by itself. If it drops a lot, that means the substrate itself is too dry. In regards to the water bowl, it doesn't matter where it is.
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70% on one side and 50% on the other ok then? I'm just a little confused. its has been going down to 42% on the hot side? Should I spray some water into the substrate rather than just spraying the top?