Talk to your school counselor. You want her to check highest rigor, and she could write something stating that you had aggressively pursued the highest level of education that your school offered, by taking 6 AP classes in 11th grade, to put the several B grades into context.
Frankly, I admire you for seeking out the best high school education that you could get. With the counselor putting it into context, it is possible that the admissions committees could see it in that light, too. I don’t think it would adversely affect your applications much.