although the bulb's DO hurt my humidity, I would try a 50W bulb, maybe a 60 if you absolutely have to. The 50W keeps mine pretty good, and since it seems like everything else you have going on is fine, i'm thinking a higher wattage could make it better. That would probably be one of the cheapest ways to go. If you don't mind spending another 20ish dollars you could probably get another uth on the other side, but like you said you basically want to stick with what you have, which I understand because I am in basically the same position.