I love your coop and run!!!
Couple things you can try -
1) isolate the bullies by themselves for a few days. Out of sight/sound. Then add them back to the flock and see what happens.
2)Pinless peepers - it's a product that reduces/eliminates pecking by the chicken wearing it. Only for use for a few months at a time, not long term, and some hens can get them off easily, but worth a shot if the alternative is rehoming someone and everything else hasn't worked.
3)Where is the victim getting pecked? Would putting a chicken saddle on her help?
4)Add run clutter, things to break up line of sight, without any dead ends where a chicken can be caught. This can help reduce stress in the coop. Eye level for them is knee high or less for us. Stumps of wood, upside down lawn chairs, pieces of plywood up against the side of the run to make a "tunnel" (with a few bricks on the outside of it to make it not slide down flat - no chicken squishing). All can create "hides" and reduce stress and bullying. Out of sight, out of mind is a real thing for chickens.
5) Separate your food and water, so it's at opposite ends - one set of food and water is hidden or unseen from the other food/water station, and hens can eat while remaining "hidden" from others in the coop. This can also help reduce stress, and give the bullies less targets. Putting a piece of plywood between the waterers if they have to remain where they are could be a good solution too, to cut the visual.
One thing to consider - by rule of thumb commonly quoted here I should be able to fit 20 chickens in my combo of covered run/coop. However, only 15 fit comfortably, otherwise I have stress/pecking issues, even after rehoming the bullies so there's no bad examples going into winter. You might try rehoming the bullies, which will decrease stress both by removing the bullies and adding space in your coop and run.