Is it not good to have any condensation on the inside of the tub? I replaced the "too-wet" vermiculite with dry vermiculite last night, but because of the humidity in my incubator, there is still condensation that forms on the inside walls of the tubs. It is a very small amount though.
Those of you that use substrateless incubation, and just use soaked vermiculite underneath your grate...I don't see how you would get no condensation inside the tub?
Temp fluctuation is a huge factor as well. The eggs are cooler than the surrounding air temp. Thus causing condensation.
You can look on my site and my Live Egg cam on day 40 and see the tubs are dry on the sites and lid.