In my experience, once a drake is pulling out feathers it doesn’t get better until fall when his hormones drop and then starts up again in the spring. A chicken saddle won’t hurt, neither will adding more females but it might not fix it either. It seems to me like my drakes are insecure little dictators who want strong females who worship them. A weak, indifferent, or a female who looks really different from the rest gets jumped on and mated with continuously. After years of drake jail and adding females to no avail, I finally rehomed my feather pulling drake and kept his baby son. The son drake then grew up with the older girls keeping him in check. He still targets the same two girls his daddy did (I have 4 girls) but he doesn’t pull feathers out or injure them when mating. Anyway, hope this helps, good luck with yours.