I feel your confusion! I am on day four of my first incubation and I'm still learning, but this is what I got from Holderread's book + information I got from Toadbriar (I bought my eggs from her):
Days 1-25 - Humidity of 55%. If your eggs were washed, more like 60%. Toadbriar doesn't really watch humidity so much as pay attention to the size of the air cell when she candles her eggs. If the air cells are too large for the day of incubation, you increase the humidity. If they are too small, you decrease humidity.
Days 26-28 - Humidity up to 80% or as high as you can get it without fogging up the window on the incubator.
I think I have this right, but hopefully more experienced people will chime in. So far my eggs seem to developing nicely. :)