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I usually candle on day 7 and at lockdown.

That's usually how I do it. I also don't candle them all at once. With 30 eggs, I'd probably candle 10 a day, but there's no harm in candling all 30 of them. They can handle cooling off for a bit without any harm.

I would consider 20% to be too low. Maybe you can get something like a short test tube? Something like these, maybe...

Try not putting anything in at all. If that brings the humidity too low, you can get a small jar (baby food or something) and cover the top partway with foil until you get the right humidity. The deeper the jar, the less often you have to refill it. It's the surface area that determines humidity.

I did that with my first two hatches. I got much better hatch rates when I lowered the humidity.

Your temperatures sound good, but I would lower the humidity to about 30% until you get pips.