I have a small cooler incubator, with water bottles. I use a light diffuser and soak the vermiculite.

I get a LOT of condensation. In the tubs, even in the roof of the cooler. I cannot get rid of it.

What I did was tilted the incubator by about 1/2". Therefore all the water droplets that are too heavy will fall to one side of the container and rarely touch the eggs. It's only been a couple weeks but my eggs are plump and aren't getting wet at all. May be something to consider.