It’s just my own opinion but I find the way the Add/Remove button display on “Add More” bloc is not enought effective.
Indeed, when you look the form, it’s impossible to know wich field is an “Add More” field and wich is not. The user have to hover over all the fields to know.
I think you could display some disable buttons near the “Add More” field like this:
Disable buttons
And when the user hover over the Add/Remove button, these buttons become more visible with a color like this:
Hover Add
and …
Hover Remove