Just out of curiosity, since I wondered if being in a different country would mean needing different humidity levels, I looked up some Australian sites on incubating.
This one suggests 50% for incubation and 65% for lockdown. This one suggests again 40% to 50% and 65% only for lockdown. This one too says 50% for the first 18 days and 65% only for lockdown. And then this one, again, says 45% to 55% for the first 18 days and 60% to 65% for lockdown.
I wasn't able to find any recommending it be as high as 65% for the first 18 days.
This one suggests 50% for incubation and 65% for lockdown. This one suggests again 40% to 50% and 65% only for lockdown. This one too says 50% for the first 18 days and 65% only for lockdown. And then this one, again, says 45% to 55% for the first 18 days and 60% to 65% for lockdown.
I wasn't able to find any recommending it be as high as 65% for the first 18 days.