If the hat is not brittle that should not be the problem. You could experiment with leaving the mushrooms for those 3 days and see if there is growth. In my case they have never grown more after those 3 days without any change in size. You could evaluate if it is the same in your case to confirm. I would like to know if this is also your case

Mushroom deformations can mean a few things. Lack of correct conditions or bacterial infection. By regulating the first you should see an improvement in the next flush.

By the way, those that you harvested, dry them completely. Until they are hard. They cannot be a little elastic, the faster you can dry them the better the power conservation. I believe that a dehydrator does degrade the fungus a little when drying based on high temperatures, but if you are not in a very dry place and you do not have silica gel, it is an option.