Your feed is already low on protein, and adding the mountain of veggies is bringing the protein level down further. Need to stop feeding the treats unless the treat itself is increasing their protein intake. Ask your feed store if they offer game bird feed / quail feed; it's typically 20% protein or higher. Keep treating them with cooked egg (91% protein) , don't go crazy with mealworms as they are high in fat too (even though a few won't hurt, they've got 51% protein), and fat hens causes ~other~ problems. Fish or fish meal is 61-72% protein, I offer canned sardines in water if my girls are heavy, or packed in olive or sunflower oil if they're on the skinny side, and I mix it with their normal feed so they don't fill up on fish and not get their feed. Ground up dry cat food is typically 26-30% protein, only do a little bit, as it's high in fat too. Hope this gives you some ideas on boosting protein without ruining your girls' diets.