I don't like to assume anything so I'll ask some dumb questions. I did not see where you described the feather loss. Typical feather loss from roosters is to the back of the head or on the back where his feet stand. Is the loss in these areas? Could you post a photo of the typical feather loss? That might give us a clue if there is something else going on or how severe it is. Some feather loss is normal but if you get bare skin it needs to be addressed. Bare skin can be cut by claws or, if it is a mature rooster with real spurs, his spurs.
How many of the hens are showing this damage? Even in a large flock like that it's not unusual for one or two to have damage but it would be unusual for many to unless there is some underlying cause. Aart mentioned a possible cause, brittle feathers. I'll show a link and an excerpt from that link just to show I'm not making it up. Typically the whole flock does not exhibit this, usually it's a genetic disorder that causes individual hens to not absorb the nutrients and use them properly, not that the minerals aren't in the feed to start with. But if it is fairly common across your flock, what are you feeding then?
Deficiencies of minerals, such as calcium, zinc, selenium, manganese and magnesium, may be associated with brittle, frayed feathers and itchy skin. There may be alterations in color or discoloration of feathers. The plumage can appear dull. Feather loss and moulting disorders can occur.
https://www.beautyofbirds.com/featherdisorders.html
Mostly out of curiosity, how old are they? An immature cockerel is more likely to be overactive than a mature rooster and is likely to have a poorer technique. The females are more likely to resist a cockerel too which can contribute to technique issues.
There are several other things that can contribute to overall feather loss, such as mites, lice, or feather plucking. That's why I'd like to make sure it is rooster caused. Let's make sure we are solving the right problem.
If the entire feather comes out, the feather should grow back in a month or so. If just a bit of the feather shaft is left in the follicle that feather will not grow back until the next molt.
When I have an issue I try to determine if it is an individual chicken problem or a flock-wide problem. That way I can concentrate on trying to solve the real problem. I also try to solve for the benefit of the overall flock, not in favor of one or two individuals. In your case I'm not sure if it is one or a few individuals or flock-wide.