This is an older post I missed so won't reply to any of those, but basically the rule is:
50% humidity until lockdown
70% humidity at lockdown (3 days before hatch day).
Temperature 99.5°F throughout the entire incubation.
If when they're hatching, the humidity spikes up, which it will, that's okay, as it's temporary. I just leave them alone, and they hatch fine.
