What are you controlling your heating elements with? I'm not sure, but it may help humidity to switch them just so the lamps aren't running as hot, which in theory seems like they would suck less water out of the air.

On the acurite there is a temp and hygro on the unit & the probe is just temp. Most people who use these put the probe under the warm hide so they know temps inside of that hide and I'm not sure about others, but my base is on my tank floor about a foot from the end of the cool side against the back glass.

Oh...and to bp.net