I haven’t had SLM so far, so haven’t tried it. I would do a thorough coop and run treatment with the Elector PSP and do the cream on the legs - I have never read a recommendation to spray the legs for SCM, and it won’t hurt to try it, but the ointment sounds like a tried and true thing...
I don’t see why elector PSP wouldn’t work for the mites around the coop - I would definitely give that a try. Careful with Ivermectin if you have a dog around that might eat chicken poops. There is a mutation common in a number of breeds (collie dogs for example) MDR1 that keeps the dogs from...