Excellent analysis. I'm going in order of your post.
IR: I think it's a good idea to know what question type you like least, so that you can selectively skip those, but still be flexible. If you discover a horrible question on a type that you would normally answer, you may decide to guess on that one and do one of the ones you'd normally skip. (Note: "skip" = guess quickly and move on; you can't actually skip a question, of course.)
A 5 is a good-enough IR score; you just want to try not to get too tired out while you're getting that score. You can guess on at least 3 (and even 4, if needed) and still hit a 5 (and this does assume that you will also get some wrong that you try to answer). So plan next time to bail on 3-4 and also be willing to be flexible if you see a really hard one for a type that you'd normally do.
Timing: Yes, it's okay to allocate some extra time to some questions, since you will have some that you answer more quickly than average (either because you're good at them or because you know you can't do it and cut yourself off).
Here's the key, though: a good way to allocate an extra 30 or 45-ish seconds is because you know exactly how to do it but it's a somewhat longer problem than typical, so it just has a few more steps that will take some more time. This problem objectively takes more time; it's not that it's a weakness of yours or you need more time to figure out what's going on. A bad way to allocate an extra 30 (or 60+) seconds = any variation of "If I just had some more time, I'm sure I could figure this out."
Also, another key: you never try to save time on something that you already know how to do. If, working at your normal pace, you can answer that question in 1m20s, great. But never try to take a 1m40s problem and turn it into a 1m20s problem so that you can spend more time elsewhere. That's what opens you up to careless mistakes.
Further, if a quant problem is going to take more than roughly 3 min, then that problem is likely not worth the time and mental effort
even if you get it right. It's okay to have a couple of problems in that timeframe, but a 3m30s+ problem is a problem that you don't know how to do in a reasonable amount of time and with a reasonable expenditure of mental energy. Don't prioritize getting something right over your time and mental energy.
In general I get about ¾ of SC wrong past 2 minutes.
And I'll just point out the full significance of this: if you don't even read the question, just guess randomly, you have a 20% chance of getting it right. If you spend 2+ minutes, you've calculated that you have about a 25% chance of getting it right. Obviously not a good ROI.
Remind yourself of that whenever you're tempted to go past 2m on an SC!
All of this gets at what that exec reasoning article says: the test is ultimately about a series of "business" decisions that you're making as you move through it. One of your main goals as you continue to study will be to internalize that decision making mindset. Read this too:
http://www.beatthegmat.com/mba/2015/08/ ... r-the-gmatAlg: 50 seconds longer on wrong than right is a bit too long - signals a bit of stubbornness going on at times. Try to keep average time on wrong answers to around 30 seconds longer; yes, they're harder, so they'll be somewhat longer, but you're still able to make good decisions to cut yourself off.
Your other main goal will be to improve the content areas / questions types in your Bucket 2.
Buckets
You mention careless mistakes in some areas. It's crucial to figure out why you made the specific mistakes you made and then to implement new habits in how you do the work / write things down / etc that will help to minimize those same kinds of mistakes in future. Read this:
https://www.manhattanprep.com/gmat/blog ... -the-gmat/I'd move coord plane from bucket 2 to 3. Sounds like you can do the easier to medium ones. Usually, there's only one on the test. And you can get one hard one wrong and not have that really affect your score.
I'd also move harder rates and work to bucket 3. Ditto.
Other than that, I agree with all of your quant buckets.
Verbal. CR. Strengthen and weaken definitely the most important here, as these are far more common than the other types you listed in bucket 2. Also, you say "guess quicker on harder problems" for Evaluate...that describes bucket 3.
SC: the test often uses false concision as a trap. If I ever find myself thinking about that as an issue, I know it's time to guess (or look for some other reason). So I wouldn't think about that. But your other bucket 2 items are good.
Yes to your plan to do timed sets of questions to help with the timing / decision-making. For quant, you may also want to look into the GMAC (official test) product GMAT Focus. It's a mini-quant section (24 questions instead of 27) but still fully adaptive, so it's a great way to practice putting it all together. (I wish they had this product for verbal!)
Your review of the questions will follow the 2nd Level studies / process that I linked in my previous post, yes? That detailed review will then tell you what you need to go back and study from books, lessons, and other materials / resources you have.
Also, don't forget to do an overall "decision-level" review. Where did you make good decisions about how to spend your limited time and mental energy? Where, in hindsight, should you have made different decisions? Why? How will you know to make those different decisions next time?
Great work - now go do it!