Experienced with hatching yes. With hatching emus, no
So you are weighing it to make sure it's losing the right amount of weight? It should lose 15% of its weight over incubation. I'll use one of my eggs to illustrate what I mean.
One of my eggs weighs 570.2 grams. 15% of its weight is 85.53 grams. That means that it needs to lose about 1.75 grams a day calculated based on a day 50 hatch, maybe a little less because it could go longer than 50 days. So I weigh it each day or every other day to make sure that's what it's doing.
With humidity as high as yours, I'd be more worried that's not losing enough weight, not that it's losing too much.