I keep mine at 60% prior to day 18 and 65% for lock down, but I am at altitude and have found that anything lower than that causes significant losses around day 16-18 and really late hatches for those that do survive. I think you can probably google the recommendations and find them that way.that does help, I will work on the humidity.
What are the two humidity levels that you strive to achieve (before day 18 and after day 18)?