Humidity questions are hard to answer. It can be different for each of us. During the incubation part, humidity is about fluid loss. The eggs need to lose a certain amount of moisture during that incubation process. If they lose too much or too little, you can have problems. The actual range you need is not real tight, it can vary some. And it is total moisture lost over the time. Spikes of low or high are not catastrophic. Think average.
Some people weight the eggs to monitor percent of moisture lost and adjust based on that. Some people candle and look at the size of the air sac. Some don't do either. A lot of that depends on our individual personality. But if you have kids, you might use this as a learning tool.
During lockdown the situation changes. They should have already lost practically all the moisture they need to. You raise the humidity at this time to prevent the membrane inside the egg from drying out and shrinking around the chick where it cannot hatch. The critical time is after it pips. Again, different ones of us have success with different humidities, even at this stage.
It looks like you have a fan in there, so your target temperature is 99.5* F. If it is a still air, the target temperature is 101.5* F measured at the top of the eggs. In a forced air, it should be the same temperatre throughout, but in a still air, hot air rises. And temperature is also about average temperature. Some spikes or drops are not too bad as long as they don't last too long. The core temperature of the egg does not change as rapidly as air temperature.
Your targets seem reasonable to me. Good luck!!!
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