DI was the section that ate the most of my prep time too, mostly because it isn't really one skill, it's four or five smushed together and each one wants a different pace. What actually moved the needle for me was timing by question type instead of by section. MSR sets eat time if you try to read every tab up front, so I trained myself to skim the tabs first just enough to know what's there, then dive back in only when a question actually needs that info. Table Analysis is really just sorting and filtering with extra steps, so get fast at the sort function in your head instead of manually scanning rows once you can sort by the column that matters. Data Sufficiency inside DI still rewards the same discipline as regular DS, write down what you actually need before you touch the statements, because it's way too easy to over-solve. I'd also say don't split practice evenly across the DI question types, spend more reps on whichever one is costing you the most time, mine was MSR. You're already sitting on a DI79, so this is more about shaving seconds than relearning concepts. Keep grinding, it clicks faster than it feels like right now.