SO-what you are saying 29 Palms Ranch-is that it is impossible as far as you know that ostriches could incubate and hatch their eggs naturally.In Texas.Wow!
Where in the world could they do so????
The confusion in this subject stems from all the figures and values involved.I have never said that your incubators are running wrong,it is the value given as 25% relative humidity which is wrong.
Similarly the value of 16% rel humidity you state your house environment to be is highly questionable.If this was really the case-you would be spending bulk of your time at doctors practices and hospitals.
(The driest place in the USA as I am aware is in Death Valley at 25% rel humidity!)
These figures of 25 and 16% should be interpreted as degreesC-wet bulb.
I would dump your hygrometer if you are using same-they are notoriously inaccurate.
This is a quote about low humidity-you can study many similar--
Any humidity of 30 percent or less is considered low and can be dangerous. Low humidity can cause breathing difficulties, discomfort and may damage a home's foundation.
With all facets of animal breeding and production it is wise to employ the KISS principle(keep it simple stupid)