You may have made a very bad mistake in removing leaves to get rid of black spot. Since it is fall, the tree was outside, it was probably preparing itself for a winter dormancy. Pruning of any sort this close to fall can result in flush of new growth. That's a very very bad thing, if you're going to winter the tree outdoors, since all that new growth willbe killed off come first freeze. That will weaken the tree before its witner rest and will greatly diminish its stored capacity to begin growing next spring.
I would stop futzing around with trying to prevent spots on leaves that will be on the tree only for a few more weeks anyway.
I'd also stop almost all activity with the tree. It just needs to be left alone, with an eye to keeping it moist, but not wet in the coming weeks. I'd also look for a sheltered spot in the yard or unheated garage to store the tree in beginning in mid-November. Let the tree get hit by thre or four frosts before putting it away...