My advice is to just feed the layer pellets as their primary diet, it contains all they need, and use the scratch grain and mealworms as special treats, used very sparingly. That will keep them in good condition. I like to use the treatsbasically for training purposes, like to get ghem to come when called, or to go in the coop before a storm and so forth. Since you have a rooster, you might eventually want to switch to an all-flock formula, as he does not need the extra calcium and some say it can be hard on his kidneys. You can then offer oyster shell in a separate dish for the hens, he won't take it and the girls will help themselves. I'd also advise putting a board up, higher than the nests, for them to roost on. They'd probably like that and if it's what they're used to, might solve your problem.