10 out of 14 had 40% humdidity for their first day, then 80% for the next four. After that, they were at 30% for two before I got worried and added a sponge, so they've been at about 40-45% for the past 3 days.
The four other eggs, of which two look dead, were at about 35% for the first two days, then joined the others at 40-45%. They were set 6 days later (arrived late).
Trouble is, this incubator they're testing is a second hand rcom 20 pro. Much as it's brilliant, I think the humidity rods need replacing as it isn't getting the humidity to where I would like it to be.
I've taken the sponge out again now, so humidity has dropped to 30%. These are shipped eggs and the aircells all look very wonky. Wonky aircells always look bigger than normal ones, which is why I put the sponge back in sooner than I'd planned. I probably made things a lot more difficult by setting them too soon, but the sellers were offering replacement if less than 50% were developping by day 8. I could hardly wait a week and then set them. It'd have been unfair on the sellers and their policy wouldn't have stood.