From what I've read (Chris Ashton - Keeping Geese, brilliant book) humidity is vital but not quite so simple as just keeping it up. Early season eggs can have thicker shells so often need a lower humidity because they have to lose a certain percentage of moisture. Weighing the eggs and plotting weightloss is, I believe, the only way to judge that. You do need the moisture up for hatching but certainly the breeder I bought from tends to run the incubator dry and spray the eggs once a day when they're turning them (incidentally, that's another point - goose eggs benefit from manual, end over end turning even if you incubator rocks automatically) until close to hatch.
Having said all of that, I've still had no fertile goose eggs and very few fertile duck eggs. I've had a batch of four fertile duck eggs under a broody and all were alive and kicking yesterday, one had hatched this morning but I don't think the others are going to make it - no movement or peeping coming from them. So my stats are way worse than yours and you may wish to ignore any advice (but buy Chris Ashton's book!). Fingers crossed for your second batch (and my one remaining kicking egg which is under a second broody),
H