You said something about pellets? The should be on starter/grower until they lay eggs
Orps are very friendly, I think my chickens get friendly when they start laying. A few little pieces of bread helps too, but only from your hand!
There's a possibility that you are reading too much into it. Different birds mature at different rates, and same breed birds mature at different rates. I would not worry about it. Any grower feed is fine for them. Plus some veggies or fruit.