There is a pecking order in every flock, without it the flock shows weakness. One way to cut the bossy ones down is to put them into solitary confinement for a week. Once you reintroduce them it can take them awhile to work their way up through the ranks, but RR are renowned for their aggression.
I moved 12 months ago. Nothing changed in order of pecking once they settled. But because they were cramped while their new run was finished they became more aggressive. Like Fancy said, I constantly had to isolate my Buff and light Sussex particularly from my silky. It was only a temporary fix...