Obviously, with only 3 being fertile, showing development, that's going to be a place to start and find out why your fertility isn't higher. Silkies have really fluffy butts and some people find the Roos have a hard time making contact when mounting, so you might want to think about clipping them around the vents and see if that helps with fertility. Once your fertility is higher, the next thing I would do is go buy a couple decent thermometers and a hygrometer and check the accuracy. Once you have accurate thermometers, you are on your way to better incubation practices. Many of the cheaper bators such as the Chinese (Janoel knockoffs), LGs and the FIs, are often off with temps and humidity gages.You should never trust an incubator's thermometer/hygrometer, no matter what brand until you check it's accuracy. That goes for any thermometers/hygrometers.
With accurate temps and hygrometers, I would set the eggs, if they are small 40/45% humidity might be fine, but I would check the air cells at least days 7/14/18 to make sure they have proper growth. I can give you links to the humidity method I use with an air cell chart and it explains humidity better if you'd like.
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