A couple comments. The damage from fence and trunk guard, just leave alone, should heal on their own.
Its always tough to give advise from pictures on pruning, but I think you got a good looking structure, don't sweat the small stuff.
The fact that you pruned is more important than having a perfect structure or making all the "right" cuts.
If you are in doubt on on more cuts to make, I usually stop and let it go for a year and reevaluate. In an orchard I'm sure they would prune more, but I'm like you, I want a good looking tree in addition to a productive tree.
As to the fungicide, I'd recommend spraying before the rains rather than after. The sprays prevent infection, not treat an infection, so are more effective before rain events.
On protecting from deer. I've got older trees, so I don't worry about it. This time of year the deer come through and chew off the end of branches/new growth that they can reach. If you've got smaller branches and or trees, I'd keep them fenced until things start greening up and deer have other food.