https://www.bing.com/search?q=is+high+protein+after+a+lonf+period+of+time+bad+for+chickens&cvid=80b55447428f424b8a3b9a256ec72421&aqs=edge..69i57.47363j0j1&pglt=297&FORM=ANNTA1&PC=NMTS#:~:text=for chickens?-,Although constantly giving them high protein feed can damage their health in the long term, short periods of increased protein are necessary for the bird to maintain/rebuild feathers and health. Always make sure they have abundant water available to them.,-Chicken Molting: What
that's what i have seen and you do want to add protein if they are in bad heath like if their sick or molting and what % is the flock starter your talking about also all I'm saying is don't feed your birds high protein so 22% and above for long periods of time because of heath issues
although i would do this
this is what feed i recommend
• Day-old chickens to pullets six weeks of age should be fed a diet of approximately 20% protein.
• Pullets seven to eighteen weeks of age should be fed 17% to 18% protein.
• After nineteen weeks of age and throughout their egg-laying cycle, hens need about 16% protein.
• Hens or chickens that are molting can be fed an increased amount of dietary protein, up to about 20% and a lower amount of calcium. Again, this should be from a chicken feed with 20% protein—a pre-lay feed for growing pullets will work very well for molting. EDIT:i got this from an article online