Try to keep a close eye on your egg clutch temperature and humidity towards the hatching bc you will get a slight increase in the temerature. At this time they do need more of a fresh oxygen exchange. Every two to three days will be sufficient. Your humidity at 99% is good also. And if you are wiping condensation away from the interior tub that's a good move. Just try not to expose the eggs too long to less than optimal temps and humidity by keeping the lid off the tub.