If you've got one of those Styrofoam incubators, sometimes they don't work well. Other than that, I have no idea what the problem is.
I hatch duck eggs on their sides and hand turn. That is supposed to increase hatch rates. I've never used a turner, so I can't compare.
Eggs can be spritzed with water daily, but the water has to be exactly the same temperature as the inside of the incubator. Duck eggs seem to benefit from a short cooling period every day. If you make it as far as lock down, you need some high humidity at that point. I run about 38% humidity up until lock down.
I hope you can get it figured out and have better luck in the future.