There is a reason they have the ISEL that just looks at scores and GPA as long as you don't have waivers, those things matter the most. I would venture that they looked the scores and GPA of those being selected and used that to come up with ISEL criteria.
If you think 30-60 seconds per application is fast, on the civilian side it can be even faster. When I look at a resume I will know within 15 seconds if it is a no, if it is a yes for the next round about the same, if I am unsure I will spend about a minute on the resume, then most of the time I know which direction, if still unsure I come back to it later. I have know recruiter friends who don't even look at each application, they are in tech and getting sometimes 1000 applications for each position, can't say that all are qualified but there is no way they can look at all of them, so luck is involved for those who get to the interview part.