That’s perfectly fine to disagree - there are no perfect answers for us to give as outsiders to this complex and messy process. Here’s my rationale:
For a long time it was a general rule to say that 700+ are great scores, and of course, in a general sense, they are, but when you look at recent percentiles for tests like Physics, Chemistry and Math IIC you see that even perfect 800s are the new 85-90th percentile (see previous comment’s link). This means that 10-15% of students taking these tests are getting perfect scores - perfect scores!
While I don’t have the stats to back it up (I doubt they’re available), I can only imagine that these same high-performing students are the same students who tend to be at the top 10% of their class (not only because of the high scores but also because they are taking subject tests in the first place). You can bet these science and math-oriented students who perform well are the same block of applicants who, as a whole, apply to math and science magnet schools like JHU. So in my scenario the school is being inundated with very high math and science subject test scores. Also imagine the frustration these committees must endure attempting to compare apples to oranges when selecting applicants. Remember that in any population it will be a bell curve with most applicants falling within a certain range, in this case, it would seem a range of high subject test scores. As a committee member, wouldn’t you love standardized tests as they compare apples to apples and allow you to definitively say (for the most part) this student is better than this student on this content? These tests really take the guesswork out of portions of the selection process, so why offer them the chance to assess you with a score that unfortunately is not nearly as competitive as the 700+ adage once indicated? Subject tests are not required by JHU (of course they are highly recommended), but if this applicant is applying as a science major (and the school only wants so many science majors) then it is very possible that a score where 30-35% of students nationwide, and maybe a higher percentage of students who are applying to a top-tier school like Hopkins, will have better scores than him/her. In my mind, don’t give these committees any freebies, force them to assess your intangibles and to rely on things like high grades and high SAT I/ACT test scores, and force them to then imagine that you would have probably scored the mean or 1st standard deviation of their other applicants. Low scores must hurt you (whatever a low score is…), but if you never took the test and it’s not required? Much more difficult to hold that against someone.
I realize preparing for a test and spending the time and money to take it only then to not send it in is frustrating, but don’t let that be the reason for submitting a score. Economics tells us to never make decisions on sunk costs.
Needless to say, there is plenty of speculation in the above paragraph, so by all means take it with a block of salt, but step back and look at how performance on all standardized tests have shockingly improved over the years. Be wary of general rules of thumb that haven’t changed in 10+ years (I remember being told 700+ as a high school freshman in 2005).
Ultimately there is no easy answer for you and it also largely relies on if you can adequately demonstrate science proficiency without sending in the Physics score. Literature is basically reading comprehension, and you clearly demonstrated that in the SATI and ACT, so that’s less of a concern. Did you take any AP or Honors science courses, and did you perform well in your science coursework in general?