I took a close look at BU scattergram results. Among the students in the top third GPA-wise, about 80 percent were admitted. SAT scores didn’t matter. This is a MA public school, and BU along with UMass are considered the safety schools among the strong students. Given that the yield rate is about 20 percent, it’s clear that most of these are RD applicants. Also, this is a town with very few first gen or URM students.
I do think the OP should add UMass as a true safety. And check with her school’s Naviance re her school’s performance with BU.
ETA: Northeastern has an admission pattern similar to BU.