I just started separating my SLW cockeral, Mr. Napolean b/c he is relentless w/ the girls. I have one sweet submissive EE pullet that has a bare saddle spot and some of the rest of the girls started loosing feather this month. I checked for 2 weeks straight to make sure it wasn't critter related. I have one cockeral and 15 pullets, so the ratio should be good. I don't want to get rid of him, so he free ranges all day and stays very close to the run. If I let the girls free range, then I put him in the run. He stays in the run after the girls coop up at night. I bring him into the coop when I'm ready to turn out their light at bed time and he settles on the roost and they all go to sleep. The other day when the wind kicked up and it hailed, I just brought him in the house to get him out of the elements. I will be making him a bachlor pad/run. If it's dark in your coop, your roo should sleep.
I just started separating him this week, but the girls do seem calmer. I am anxious to see how fast they grow their feathers back. Good luck! I know it's frustrating.