OK, your reasoning is flawed. 
No they don’t. The CDS gives the 25th/75th percentiles for SAT EBRW and for SAT M. One cannot simply add those two numbers together and be accurate. But not to worry, sites like prepscholar also make that common mistake.
IMO, 1550 is too high. A 1500, and even slightly lower, will keep you in the mix. But at the end of the day, all of these schools evaluate holistically. Each and every one of these schools routinely rejects 1600/36/4.0 applicants while accepting applicants with lower stats.
While a fun parlor game, trying to make sense of the admissions statistics for colleges with single-digit acceptance rates is just productive as analyzing past Powerball numbers to predict tonight’s numbers.