Problems from hen mounting hens

Pictures 1-3: The damage, Picture 4: The aggressor, Picture 5: Swarming the little one's saddle

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My hens have had weird feathers for a while and I thought they were molting but then I noticed some of their feathers were broken which made me suspicious. There were 2 possible culprits and I finally caught one mounting the others.

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Many questions:

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1a. How do I stop a hen from mounting all the others?

1b. Do I have to separate her?

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1. How do I stop a hen from going broody because she's being mounted regularly?

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3a. I put a saddle on the littlest/worst treated one. She's wobbly walking around in it and won't stop fussing. And the hens are now pecking at her saddle even more than they did at her back. Do I leave it on for them to get used to or take it off?

3b. Should I put saddles on all of the ones who've gotten roughed up? (No wounds, just missing/broken feathers)