Depends on where you are in the hatch. I try to hit middle ground for humidity depending on how the eggs are doing. During incubation if the air cells are too small then decrease humidity, too big then increase it. The goal is to have it about right before lockdown.
At hatch time it's possible to help chicks hatch if the air cells are too small. Here's a thread I found about helping eggs with saddled air cells hatch but I think it would apply to shrink wrapped chicks too
Assisted hatching - Saddle shape air cells
