Eggs should usually go into lockdown on day 25 (you should see the air sac dip lower on one side) and I usually have mine at 75-80% humidity. If you can't get it up that high try putting some soaked sponges in with the eggs! Then wait, watch, keep your hands off the eggs (!) and celebrate when they hatch around day 29! They can take up to 4 days to hatch too, so patience is key.