Don't worry if the players all have +3 in every stat. It's not an issue like having all you're players have 20 in every stat is an issue in D&D.
They can still miss and get partials, and like in Dogs, 'powerful' PCs aren't a problem because you're not against the PCs as an MC. You want your players to make moves and you want them to deal with the Fronts in the fiction.
If the Angel is all: man, I don't wanna be a Driver anymore, instead I want to be a Hardholder. That is they went from being an ambulance Driver to a hospital-Hardholder. I'd be okay with that. They'd probably lose No Shit Driver, but maybe not even. They lose the stuff that makes sense fiction-wise, not balance-wise.