Breed pips Day 20--lockdown earlier?

[Mrs. Mucket]

This is my second hatch of Freedom Ranger chicks (parents are hybrids) where most of the chicks have pipped on Day 20, some hatching that day too. Next time, should I lockdown on Day 17, or is two days being still with higher humidity enough?

 

[ScissorChick]

No, I'd just keep locking down on day 18

-Scissor