Your treatments sound spot on. In my experience(pigeons), canker was never completely irradicated only controlled. Stress of any sort could cause outbreaks. Scrupulous cleaning of waterers and feed pans was absolutely necessary as well as not allowing access to ground water.
Worked 3 dogs and filled bird feeders at the club.
Mowed the top part of the front lawn. It's only been a couple of days, but the crabgrass grows 1.5" a day this time of year.
Cleared weeds/grass from two stumps in the front yard.
Will remove a dying butterfly bush and deer damaged Euonymous.