A couple of things about the hens that start treading other hens. Yes it is partly a dominance thing, but there is a hormone shift and they actually will take on the characteristics of what is known as a "hennycock" . In fact there are some breeds, especially the games, that will usually have one or two females that look and act more like a cock bird. They will even fight them as the hennycock will confuse the other cock bird. But they will mount other hens, will crow, and can be very aggressive.
The production reds are not supposed to become "old birds". They are bred strictly for the production and at 2 are "physically" old and used up. They lay themselves out. And some strains are also aggressive. I have 2 that are of a production strain that were given to me and one will peck me every time I open the pen door to do water. I grabbed it after getting a nasty pecking , by the neck and shook it up pretty bad. Tried to kill it but didn't manage so it went back in the pen and ran in the house. Maybe it will discourage it for awhile. I have no time to be processing a hen or 2. It will go to the swap meet if we go in early May and be dinner for some ethnic group. I need the room to raise some more Langshans.
You can check the Barred Rocks to see who is laying. There will be at least a 2-3 "finger space between the bones at the "cloaca" which is the opening for the eggs and chicken poop. Easiest way is to hold the hen in one hand/arm with her head like tucked under your arm and her feet/legs between your fingers so she is resting on your palm. Take your other hand and spread the feathers so you can find the two bones and see how many fingers you can lay side by side there. 1 means not laying, 2 means possible, 3 or more means definitely laying. Also their combs get very red when they start laying and usually get a bit bigger and plumper looking. A non laying hen usually has a smaller and "withered up" looking comb, with it being paler and kinda scrawny and wrinkled. After a hen has laid a long time she will get paler around the comb and face.