So as Gary suggested, I moved the Air off the table and put it on the dry rubber landing of an absolutely dry ladder I brought outside for this purpose. As you can see from these screenshots, the Air dropped only a couple of percent and remained much too high throughout the night.
The accompanying screenshot shows the PWS in my area (including my Davis in the center). The Air is reading roughly 15% too high and seems unable to shed its moisture. This isn’t the first time I’ve seen this behavior. I also included a shot of the temperatures in my area and with my Air (28.6) sitting at 2-3 degrees below my VP2 and all other PWS in my area, that doesn’t help the RH reading.