I am not familiar with all the schools on your list, but I do know that some make it easier, even more possible, to take more science electives than others because of other requirements, sequencing, etc.
While your son may change paths in high school, I would choose the school that offered the most STEM possibilities (not necessarily most classes, btw) should his interests remain unchanged. It seems that more kids move away from STEM than toward it in high school, but that’s just my sense, nothing based on data.
Most BS will do a more than adequate job with writing. Those kids write a lot!
I say this as the parent of a kid whose interests changed during high school as well. And one whose writing was not particularly strong in 9th whose college profs frequently comment on the quality of his writing.