I watch Justin Rhodes too, and love his youtube channel. Sometime long ago, he did specify their treat vs feed ratio, but he doesn't do that all the time. I also love how he runs his chickens behind other animals in their 'tractors' to pick up what the others left behind.
Grit, good. Calcium supplemented and on the side, good. 3-grain? STOP. That's like feeding your chickens cotton candy, potato chips and Kool-aid all day, every day!
Their overall treats vs well balanced feed ratio should never exceed 10% by weight (not volume). Treats are anything that's...