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Your rooster is being a typical human-aggressive rooster. This type of behavior transcends all breeds, and is especially common in hatchery quality birds (they don't breed for personality, they breed for volume).
He is esentially treating as a threat to his girls, probably because you views you as a submissive roo. Dominant roosters knock submissive roosters off of hens when they try to breed (in your case, when you try to pick them up.)
The next time he does it, stand up straight, spread your arms wide, and slowly walk towards him. Keep walking, he'll back up several times. What you are looking for is him to stop standing and facing you. He'll eventually give up his challenge and go about doing normal foraging things. Also, if you see him mating his hens while you are present, knock HIM off the girls. It sends a clear message to that little rooster brain that YOU'RE the dominant, not him.
If the attacks just keep happening even after working with him a while, get rid of him. He'll breed aggression into the chicks, and there are too many nice roos with no homes to put up with that.