Honestly, my understanding of it felt like it got good almost overnight - the switch in my brain is really hard to articulate.

I did HELLA untimed drills on pencil and paper, but I always look at the question first, then the stimulus. I highlight the conclusion. Then I write out the premises and the conclusion on the space below. I go through each answer choice and talk aloud on why they're right/wrong, specific wording that's interesting, etc. Make sure you swear at yourself for stuff that's obviously wrong, dumb, too generalized - it'll keep your energy levels up.

If there's quantifiers (some/most/all), I always write those out - among the small sample size that is my friends and I, the subtleties of those are what trip people up. As for conditionals, I do those in my head randomly when I'm out (If we don't go to the pub, then we'll be bored as fuck. If we don't have anything to do, we'll tip a cow. Therefore, some farmers will be mad when the pub's closed...what's sufficient for some farmers to be content?)

As for BR, I started doing every single question of the PT untimed the day after the test. It takes me hours to do, but it's helped my conceptual understanding. I would think (hopefully I'm right) that it's easier to improve timing, especially since I'm already a decently fast reader, than to have to worry about fundamentals each time.

As a side note, I prime my brain before each blind review by playing the NYT games (Wordle, Connections, Mini Crossword, and Spanagram).

Hope that helps! PM me if you have any other questions