Egg two actually doesn't look that bad-you're about day 12 right?? Egg 3 is saddled shape, so it's much harder to judge those, but I'd say it's on the bigger side but 4,that is way large for day 12. Have you ever checked your hygrometer for accuracy? Unless you are in a real arid environment I would not expect that much air cell growth from eggs with the rates you quoted unless they were more porous/thinner shelled. I would personally run about 60% and see if that slows the growth down enough.