I agree. Throwing them feed can end up with a lot of waste. Putting it in a feeder of some type is your best option. Birds can quickly make lots of feed disappear into the ground by scratching. Your birds may not be eating all you think they are.
That's a pretty low protein content. I personally would fine something with a higher protein. They will eat less, and it will be better. 16% is the minimum daily requirements for a laying hen. I personally like 18% as it give me some leeway to feed scratch.
Is yours a pellet or crumble...