Hatching Mandarin eggs-day 29 help

[marelizevn]

Hi everyone, I am in day 29 of hatching mandarin duck eggs with still no pipping internally in sight! The eggs are moving and I’ve had a quick look. They are all alive in the eggs. We did have 1 day where I probably had at least 3hrs if temp drop due to a power cut at day 10 but otherwise have had a stable temp of 37,5 degrees Celsius with a humidity of 45-50%. I increased it to 60% on day 26 and stopped turning the eggs with regular checks. I only open the incubator if I have to add water to increase the humidity. Any ideas what’s up and what I should do as it’s my first lot and I’m stressing beyond!!
Thanks guys
Marelize