You are just a hop-skip & a jump from me.. How do you like all this rain we have been getting? We are mowing 3 times a week. My pig pens are swamps..I recently have had the same problem. We have had so much rain and the humidity has been very high. We recently had over a foot of rain when normally we should have gotten 2 inches for the same time period. I tried all of the suggestions. I wanted my humidity around 30% because that is where I have the best hatch rates. I couldn't get the humidity below 50%. Finally I got some Damp Rid and put the container in my water tray, I incubate in a cabinet. It worked. I have chicks hatching at this minute. I recently bought some 20 gram packets with moisture absorbing beads. I haven't tried them yet, they turn color when they need to be changed and are reusable.
That was a good suggestion to the OP, I have a "Damp-rid" in my incubator room. And a pail of bbq charcoal.