Should I send my SAT Subject Test scores?

SAT Subject Tests are optional for JHU and I am not sure if I should self-report my scores on Common App because they are required by some schools and not others. I have a 670 US History, 640 Biology M, and 630 Math Level 2. I plan to major in Biology. Should I send any of these scores? JHU says that they highly recommend them, but my scores are not good. Should I not self-report my Subject Test scores on Common App if I am not sending them to JHU?