Chris,
I wouldn’t worry about it too much. Your tree isn’t perfect, but that’s OK.
I know what it’s like to have focused intensity on wanting to do everything perfect on your new trees. But new peach trees will take lots of pruning mistakes and still go on to make lots of fruit. I know because I’ve made just about every pruning mistake possible.
One of my first peach trees I didn’t start scaffolds till about 5’. Then to keep it to pedestrian height, I couldn’t hardly let anything grow, unless the growth was horizontal or growing downward. It was a really funny looking tree. Looked like an umbrella. Because there was nothing to shade the scaffolds, the sun cooked the tops of them and the bark on the tops of the scaffolds died. Only the bark underneath the scaffolds was alive. Still that tree produced loads of peaches over the years.
So don’t fret, your pruning mistakes are nowhere near as bad as ones I’ve made. Your tree will likely go on to provide large amounts of peaches over the years.
And remember, when I commented on your minor pruning mistakes, I qualified my statements by saying, “This or that will likely happen if you make that pruning mistake.” Or, “This or that tends to happen if you make that pruning mistake.” It doesn’t mean it will happen, just that it’s more likely.
Peach trees don’t always punish us for our pruning mistakes. Even when they do, the punishment is often mild.
One the scale of one to ten (ten being the most severe things you can do to screw up a peach tree) I’d say your pruning mistakes are a 2. Even if the scaffold breaks off, it won’t happen for a long time, and even then most likely you’d just lose the one scaffold.