Hi keggen. it was a VERY LONG winter in Minnesota this year. I've been getting some various eggs too. my birds are starting their second year. I felt so bad for them stuck in their run --as they were free rangers last summer-- that I did give kale and spinach 3-4x a week in the run just to give them a little green while they were surrounded by their "white hell". LOL. I think you will find that the girls will settle into their summer after some adjustments with their diet free ranging and some contentment with fairer weather. One of my EEs, on a really nice day here a couple weeks ago laid her regular egg right away in the AM, which has bits of sandy calcium (normal for her) and then later that evening laid me a rubber egg. I think she just enjoyed her sunny day so much and was so happy she had to give me two eggs. Ha! Even though one was soft. I just got one from her today though that was smooth. She's working it out. Another EE I have never laid last fall went through the winter not laying...then started this March with messy looking bloom on her shell. She's just an odd one. no egg looks the same from her. But now here the last few weeks I notice more consistency with her eggs. Sounds like you're doing your best trying feeds, giving oyster shells, allowing free ranging. I just believe that there's waxes in wanes in the birds nutrition (what's available to them if free ranging) and varying degrees of their contentment which I also think gets reflected in egg production. They're fun to figure out aren't they?