Surely it's a little more specific than that? I'm used to winning in high-stakes standardized tests (which may explain why I'm favorably disposed to them), and in employers' assessments of my performance (and willingness to rehire me), but I'm used to losing in tech interviews.

I don't think so. Beyond that you are looking at the noise of the system which is why even over/perfectly qualified candidates have an interview failure rate of up to 50%.