That makes since. I figured that the hen turns the eggs A LOT and one year I turned the eggs fewer than 5 times a day and the next year I turned them 5 or more times a day and I got much better results. I think the more you can turn them, the better, although I try not to open the incubator too...
I noticed that turning them 4 + times a day works better than turning them less. I also candle mine a whole lot because I like watching them develop. I don't see the harm in candling. I always wash my hands before I do it, and the candler bulb is warm so it is not like the egg will chill a lot...