BDlvr posted a great link. Here's a qoute from it:
"The eggs are placed in plastic containers with four parts vermiculite to one part water by volume, burried about two thirds of the way in the medium. The Helix is dialed in at 84-86 degrees, with the probe inside of one of the plastic containers placed in the center of the incubator on the highest shelf. The plastic containers have two one eighth holes for ventilation. We cover the holes with pieces of tape for a few days to a week when first placed in the incubator until we see water condensed on the inside of the lid. Then we pull the tape back.
We never actually spray the eggs, but we do mist the inside of the lid if there is no condensation on the lid. Be careful not to have too much condensation on the lid, or water will fall on the eggs. We usually only have to spray the lids once or twice through the whole incubation process."
As you can see they don't add water to the substrate during the entire incubation cycle. Adding water to the actual substrate can add too many variables that are now out of your control. It's really an option of last resort. They also DO NOT recommend condensation on the lid as it will drip on the eggs. At 90% - 100% humidity condensation is a huge problem. Moisture is far more impotant early on in the process. If it's too high towards the end of the process it can have a negative effect.
Misting the lid a few times is a great idea. This gives you better control if they're becoming too dry. It's important that you do not try and correct an issue in one day. They should be brought back over the course of several days in order to avoid over doing it. Too dry is better than too wet as it's reversible. Don't mist the lid until it's soaked, just a very light misting will due.
If possible, post pics before you do anything. BDlvr uses the word 'collapsed' but I'm guessing that your eggs have not collapsed.