This is a thought--can you go back to the source of the birds and ask the production rate? If they should be laying at a higher rate, have another look at the food available to them. Some breeds are better foragers than others; how was the parent stock raised? Perhaps they have lost some of the foraging abilities. You are the best judge of that to compare these Leghorns with your previous flock.
To lay eggs every day requires huge amounts of protein to be eaten everyday. ANd the larger the egg, the more protein. Are your birds getting enough food to support a high rate of lay of large eggs? Commercail leghorns literally have feed infront of them, and expend NO energy to find the food or water--it all goes into the eggs.
This is meant as food for thought. You might have a look at how much they are really eating. Maybe this is the answer.
GL
To lay eggs every day requires huge amounts of protein to be eaten everyday. ANd the larger the egg, the more protein. Are your birds getting enough food to support a high rate of lay of large eggs? Commercail leghorns literally have feed infront of them, and expend NO energy to find the food or water--it all goes into the eggs.

This is meant as food for thought. You might have a look at how much they are really eating. Maybe this is the answer.
GL