Seemed to be a little grabby to me also....
I gotta tell you, I just picked mine up today and I was expecting what you've said about the touchy brakes. No more worries, my experience is that they are not bad. I was worried because my Wife's '14 Explorer will put you through the windshield especially when I only drive it every couple of weeks and am not used to it. Compared to the Explorer, the Mustangs' are not bad at all. I suspect you'll get used to them.