You have to have humidity to suit YOUR climate. All info is good, but figure out if you have dry, normal or high humidity where you live and adjust the humidity to that.
I shrink wrapped 4 peachicks nd 1 goose because I did not have the humidity high enough through the first 18 days. I was trying to do the dry incubating but with my climate (high desert) it was the wrong choice.
Think about your humidityon an everyday scale. If it is dry, go higher, if it is normal then perhaps 40-50 % humidity for the first 18 days, if it is humid then 25-35 might be good for you.
A good way to tell is check the air cell. If it is shrinking fast then up the humidity. If it is not getting smaller then down the humidity.
I have just started weighing my eggs before incubating too. The eggs should lose 12-13% of their weight to hatch out good (remember to up the humidity the last 3 days to 65-80% again depending on your climate)
Good luck!