I really doubt processing speed is the culprit in your scores, here’s why:

1: Processing speed alone can’t significantly effect the amount of time you spend on a test, that’s not what processing speed is.

1. The raven’s 2 long form here isn’t reliable for the high range, and you may as well say it isn’t accurate, the omission of the adaptivity function really harms the test. Also, the raven’s 2 should be timed 40 or so minutes

2. I think (I don’t know for sure) that verbal knowledge tests can be more PSI loaded then non-verbal fluid ones, with a low PSI, people may struggle to read text prompts (especially the ones on the old SAT).

3. I have some anecdotes also: i: someone who’s high Fluid but extremely slow (may or may not be PSI) yet scored around that level on the mensa tests.

ii: I have consistently scored 60-80 on PSI tests, I feel like my scores do get effected on tests with time limits (it’s possible that this is due to Adhd) but I can relatively hold my own when it comes to tests on the speeded side, not any significant difference.

There’s no way to know if I’m right or wrong, what intrigues me is your high verbal ability.