There's an important clue in your own post. You said you feel decent about the concepts but can't solve quickly under pressure. That gap between "I know the theory" and "I can solve it fast" is almost never closed by tricks, shortcuts, or pacing hacks. It closes when the content moves from understood to mastered, and those are two different levels. When a topic is truly mastered, you recognize the question type quickly, you know the approach before you start working, and the steps flow without hesitation. Speed shows up as a byproduct of that depth. So before I answer your specific questions, I want to reset the frame: you're not hunting for time-saving tricks, you're hunting for the topics and question types where your knowledge is still one level too shallow.
On resources, the honest answer is that no book or video channel hands you speed. What produces speed is structured, topic-by-topic work: relearn a topic thoroughly, practice it untimed until your accuracy is consistently high and the setup feels routine, run a careful error analysis on every miss (concept gap, misread, careless error, or trap), and only then layer in timing. If your current prep is a patchwork of scattered materials, a clear, comprehensive, structured course that isolates topics, sequences them logically, and tracks your accuracy will serve you far better than collecting more resources.
On getting stuck between two Verbal answer choices, that moment is usually a signal that the passage or argument wasn't understood precisely enough on the first read. The fix has two parts. First, slow down your reading. It sounds backwards, but rushing through a CR stimulus or RC passage is what creates the fifty-fifty situation in the first place, because you arrive at the choices with a vague impression instead of a precise understanding. Second, when you're down to two, don't reread both and pick the one that "feels right." Go back to the stimulus or the relevant part of the passage and apply pinpoint logic: what exactly does the question task require, and which choice actually does that job? Be careful with word-matching, too. Trap answers often echo the passage's exact wording while distorting its meaning, and correct answers often paraphrase. Eliminate on logic and meaning, not on familiar language. In practice, take as long as you need on this final-pair analysis and write out why the wrong choice is wrong. That's the skill that eventually makes the decision fast.
On pacing strategies, they have a place, but they're the last layer, not the fix. For DI, break the section into 5 chunks of 4 questions and 9 minutes each, and check the clock at those checkpoints rather than per question, since the five DI question types have very different time profiles. If you're behind at a checkpoint, don't speed up uniformly. Pick one or two upcoming questions that don't suit your strengths, make an educated guess, and move on, protecting the questions you can solve well. Also, a lot of DI time is saved by minimizing math: when the answer choices are spread out, estimate instead of calculating precisely. For Verbal, resist the instinct to read faster when you're behind, because speed-reading reliably lowers accuracy and costs more time in rereads than it saves. And don't overinvest in the first several questions of a section hoping to "lock in" a score early. That myth eats time you'll need at the end. One more DI note: DI tests Quant and Verbal concepts in new formats, so a meaningful part of your DI improvement will come from deepening your Quant and Verbal foundations, not from DI-specific work alone.
One calibration point on your target. The Focus Edition scale moves in 10-point increments ending in 5, so "700+" in practice means 705+, and the jump from 630 to 705+ is substantial. It will come from content depth, not test-day tactics. So here's what I'd do: pull your last few practice sets or mocks, identify the topics and question types behind your misses and your slow correct answers, and rebuild those areas one at a time with untimed topical practice before reintroducing the clock. Save the checkpoint pacing strategies for the practice-test phase, using the official mba.com tests, once your accuracy is where it needs to be.
Good luck!