I feed 20% all flock. We have some large breeds, and found they needed that boost, leading to less behavioral issues, but anecdotal based on one persons flock. Also, when I feed treats, I’m not taking their protein too low bc I’m diluting it with treats, since the my start with a 20% feed. Since yours are more like pets as you noted, that might be one reason to find a bit higher protein so any treats don’t dilute their intake.