I was having trouble with my mini advance humidity as well during my first hatch. I filled 1 chamber and the humidity sat between 50-60%. Then during lockdown, I filled both chambers and the humidity went up to 70% (80%+ once they started hatching). I had 4 eggs in there, and all 4 hatched.
However, 3 of the 4 chicks (silkies) had leg problems. 2 had to be put down because of bad slipped tendons, and the 3rd has had to wear leg bands, and I "think" it has a little bit of a spinal deformity cuz the tail sits the tiniest bit crooked.
So I'm trying to sort out the development problem. First, what I think is likely, is that these were the pullets first eggs that I set. Was that it? Could their development problems be caused by the high humidity during incubation? Or is there a turning problem (as my rather quite knowledgable farmer neighbor told me?)... with it being silkie eggs and they're smaller, maybe the eggs were slipping a bit and not turning completely?
Anyways, for this next batch that I have in there now. I just took a bit of paper towel, folded it up, dampened it and stuck it in the first chamber rather than filling it with water. This seems to keep the humidity at 40-45%. I feel much better with that. As for the turning, I bumped the angle up to #8. According to the size chart, my silkie eggs are right about a 6 or 7, but I have noticed that it doesn't completely turn it over (having marked 1 side of the egg with an X, and the other side with an O). Since it would move back & forth, it was only rocking the eggs. I know that is supposed to be ok, but with it being on level 8, it is completely turning the eggs over each time now. So we'll see if that helps as well. I have it set to turn every 45 minutes.
Please Please Please let me have healthy chicks this time!!
Any other ideas?