Your coop/run looks o.k.I’ll look into those. I don’t have pics of the bumblefoot, but I do have pics of the coop/run:View attachment 1698937(It may not seem like there’s enough ventilation from this pic, but there is, also, sorry the walls are dirty, oops)View attachment 1698938 View attachment 1698939Their run isn’t very large, but we can’t let them free roam, and by city ordinances, we can’t expand, otherwise we’ll be violating a thing where the run can’t be within however many feet of others’ houses.
It may be that you aren't getting all the kernel/infection out and it's just re-occurring.
Have you kept the feet wrapped, checking every few days, until completely healed?