weight loss is actually from development, which uses up the moisture in the egg. You always want to optimize development of the embryo. I would suggest rotating the eggs every couple of day.
I hope you have a good hatch this time.
If the power goes out within the first day or so, the eggs go back to the pre incubation state. They will pick back up on incubation when the incubator gets back to temp. They can go days or weeks like that!
Check for signs of life. Candle and see if they internally pipped and see if there are any chicks inside to chirp at you.
Sometimes you will find one or two still going!