Im not an expert on food analysis (and someone who is would need to know how much of each item), but I wonder if adding another protein source might help. When I have looked into chicken food "recipes" there is often a animal protein in addition to the meal worms.
They will not leave shells behind if they are eating eggs, but
might get messy faces.
They will not leave shells behind if they are eating eggs, but
might get messy faces.