It would benefit the females to get 2 more females. Give the 2 older hens to the dominant drake. Get 2 new females for the other drake. If you can't do that sort them in pairs.
At one year old(?) they are at breeding age and males (drakes) are highly aggressive especially this time of the year. You can pen them in their own pens as mating pairs or you are oing to have to get rid of one male and leave one with the females. The one that is spending time huddled will...