I keep my humidity at 30% which is often a dry incubation since I live in the PNW. I slowly bring it up to 60% only at pipping with silkie eggs. Silkie chicks die easily during incubation by drowning in the shell if humidity is too high too soon. Especially if there are a high percentage of vaulted skulled chicks. I use a Genesis 1588 using this method and have gotten better hatch rates over all. Also, silkie eggs only if you can. Hatch rates with silkie eggs go down when they are in a mixed batch with LF eggs generally speaking. Handle silkie eggs with utmost care. Try not to handle or candle too often once they are set. These tips work for me. Good luck.