I also use the "dry" hatch method but here in the high desert that means adding water constantly to keep humidity between 25-30%. At lockdown I up that to 55% but I have to close the vents more than halfway to keep the humidity up. IMO it's better to keep the vents as open as possible. That being said, I have had awesome hatches in my Brinsea. Between 80-100% hatch rates but most of those were not shipped. There's only so much a good incubator can do... Lol
Where I'm at I have trouble keeping 40% during most of the year.