I’m a high school senior myself, so take my perspective with a grain of salt, but if your school requires you to take AB calc before taking BC calc(that’s what you’re saying, right?), taking AB shouldn’t negatively affect you. Colleges always look at your transcript in the context of what your school offers and what you were able to take.
Don’t self-study for AP CS Principles. Don’t do it. It’s a pretty easy class/exam, and since you’ve already taken AP CS A it would just be a waste of your time.