I just remembered one thing I did to the tank I had that was similar to the one you have, it was just taller. On the front there is a black plastic trim that runs under the doors. In this trim is holes that allow for air flow. I found it was letting my humidity out and making my fogger work harder. I ended up covering most of the holes with black electrical tape. The trim is the same width as the tape and if done cleanly you will not even be able to tell its on there.
You need some air exchange but just enough to keep the air fresh and not enough to drain the humidity out. You will be able to cover most of the open screen and the front vent and get better control of the tank.
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