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Are you only filling the one-cup well that's in the middle? If so, and your humidity is more than 55%, you need to get/cut/make some flat pieces of styrofoam like what's found on restaurant carryout boxes. Cut various size pieces that slightly smaller than the sides so that they will float freely, thus covering the water. Doing that will decrease the surface area of your water, hence lowering the humidity.
I have two Hova-Bator Genesis 1588's and they have never reached 81% with only having water in the main center well, i.e., I think you're either filling more than one well, or water is overflowing into a second well, thus increasing the water surface.