I’m a current Wellesley student too, and agree that your EC’s are great. I wouldn’t worry too much about demonstrating interest in Pol Science since Wellesley doesn’t admit students to particular programs or majors. Lots of people change their course of study once they get to college so they don’t use your prospective major to make admissions decisions.
I’d also recommend trying to highlight your academic capabilities in other places of your application. Wellesley can be a rigorous place academically, so admissions officers may want to confirm that you can handle the courses so you’re set up for success (esp since your GPA may be a little lower than the average and you’re dropping an IB HL class). If you don’t want to retake your standardized tests, maybe consider addressing this in your personal statements or recommendations?
Good luck!