I was also constricted by time on this hatch. I ran mine for about a day and a half before I added the eggs. My humidity raised about 15 percent, I also do dry hatch so I just let that go. I've been about 25-30 percent since I've placed the eggs, and that's right where I like it. I don't like to see it get less than 20. Also, I did one increase on the thermostat. I kept catching it on 97 degrees. Raised it to top out at 100 and that's working better. But even though these are all the components I had in my incubator last year, they function so different in their new "house", so I don't know when I'll trust it, maybe after I candle them all Wednesday night.
Edit to say after I adjust my thermo, it takes quite some time before it's done getting to temp. And I hand turn. For the 41 I have set this time that takes me 3-4 minutes to do and the top is off the whole time. My temp drops from 100 down to 96 and it takes it almost two full hours to rebound. After that, it doesn't move from 100 till I open it again to turn.
Edit again to clarify what I thought sounded vague! I ran the two together. When I adjust the thermo, I just slide the top over to expose the thermostat and adjust it with a screwdriver and replace the top. Then, a couple hours later, it's the warmest it's going to get. I hand turn my eggs which takes the 3-5 mins, and it takes it 2 hours to recover from that. So after any change on mine, two hours minimum before another "tweak".