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I'd go one more day. Depending on your humidity levels, you could bump it just a bit. For example, if you incubated at 30, bump up to 35 today. Then tomorrow when you do lockdown you go the rest of the way up there.
The traditional way is to incubate with one level and then spike it up there on lockdown day and keep it there. I stagger my humidity levels a bit. Starting on the day before lockdown (day 17), I increase by 5%, on 18, add another 5%. On day 19, that's the day I hit my target hatch humidity, be it another 5% or 10% or whatever. For some odd reason, I get better results doing this than if I just suddenly shift from incubation level to hatch level. Not really sure why but test batches I ran produce up to a 15% better rate on shipped eggs and on some hand delivered eggs (some of which sat in the fridge for a week), I wound up with a 100% hatch when the breeder was experiencing a 80%. Going to test both processes with my own eggs once my babies decide that I've given up getting eggs and begin laying.