I’m not sure this info changes any of the feedback above, but taking the Spanish test, when you are a native speaker, was probably not the best choice in terms of rigor/challenging yourself/demonstrating subject mastery.
I really have no idea (nor will most CC posters) how MIT AOs will view the Spanish test as it’s not one of the required subject tests…to recap, you are submitting the math 2 800, bio 530 and Spanish 800 test scores?
At this point, there is nothing you can do/change with regard to your app and the decision making process is out of your control now. Good luck.