I have delawares and so far they have been good and their reputation is pretty good for egg production. I am working through the integration of 2 buff orps with them. All mine are pullets and not at POL yet. THe buffs are about a month younger than the Dels and getting picked on a bit. Nothing serious yet no injuries just a few blusters and and an occasional peck they can usually escape and I can separate them. They have only been together in the run for a few days and still working out who is boss.
Sounds like normal flock politics. All your breeds are Heavy LF so doesn't sound like you have any lightweight or smaller breeds to get bullied when they all reach adulthood at around 2 years.