I do dry incubation when I can (when my bator will hold above 25% totally dry,) but I shoot for 75% at lockdown/hatch. I would never purposely attempt lockdown at anything less than 65% and that would make me nervous.I am not sure if dry hatching is a good idea, dry incubation yes, but they need some humidity for hatching. My sister in Oklahoma tried dry hatching (adding no moisture at lockdown) and she lost half the batch.
Hopefully your humidity is around 50-60% for lockdown