Egg air cell not progressing???

[Goosey Girl]

I have one goose egg at day 21 in the incubator that has not been losing the required weight. I have been dry incubating and it shows humidity at 25%, but the air cell is not growing the way it should. The little bird is very active in the shell and I figure the shell is just extraordinarily thick.

Has anyone encountered this before? I don't know what else I can do to get the egg to lose the weight. Any suggestions? What can I expect during hatch, if it makes it that far? I know the gosling will probably have difficulties coming out. Please share your ideas!!! The egg is Sebastopol. I am very familiar with the posts "Step by step guide to assisted hatching" and Pete55's awesome guide had to do so a few times last year. I just want to know what to expect with it. Thanks!!!

 

[Yorkshire Coop]

Are you misting the egg each day? Although it sounds counter productive the misting will actually draw more moisture out. Misting replicates a goose going off to eat, swim and poop as she would return to the nest damp and get back on the eggs.

 

[Goosey Girl]

Misting, cooling 15 minutes a day. All other eggs have been progressing fine with an expected 12-15% total weight loss, but this one egg that started at 191 grams has only reduced to 182 grams in three weeks, on track for maybe 6%. It should be weighing around 170 grams right now.