Okay, so it sounds like the quant issue is more about the actual content being tested, while in verbal you're taking too long on the reading-heavy questions and then that messes up your timing for the whole section.
At this stage, you don't want to complete all of OG or all of the advanced material in our books - that only comes at the 650+ level.
You say that you have the 8 strategy guides. You also list a lot of quant topics that are a struggle for you. When you look at the material in the strategy guide itself, are you okay with it? Or are you struggling with it? Do you understand it in pure math form but struggle when it's in official question form? Or are you struggling with it in pure math form as well?
If the pure math is still a struggle, then you may need to go one level "down" to the Foundations of Math material, and then build your way back up to the regular chapters in the strategy guides. (Ditto for verbal - there are two separate books called Foundations of Math and Foundations of Verbal that you may find useful / necessary.)
If you're 100% fine with the pure math but can't apply that knowledge when you get to OG-type questions, then you are going to need some form of outside help. That doesn't have to be a class - it could be studying with friends or finding people online with whom you can study / exchange ideas. But you're going to need help to learn how to think about OG-type questions - it isn't just a matter of knowing the rules / facts.
Use the forums here and at Beat the GMAT. Also, go through old articles on our blog and look for articles that talk about how to do specific problems. In those articles, pay attention to the information about HOW you know what to do, how to decode what they're really saying in the problem, etc.
Here are some other resources along those lines:
http://www.manhattangmat.com/blog/index ... questions/http://www.manhattangmat.com/blog/index ... -Problems/Also look at the resources in this article, particularly the how to study / how to learn section:
http://www.manhattangmat.com/blog/index ... -the-gmat/For RC/CR, do you think you're struggling with the reading itself? Or is the reading comprehension fine but you struggle on the actual questions?
I'm going to assume that we're starting with a reading issue, but let me know if I'm wrong. Take a look at these and see what you think:
http://www.manhattangmat.com/blog/index ... p-passage/http://www.manhattangmat.com/blog/index ... -passages/