Thanks
vv65 - I think that you are right. I reviewed the Manhattan SC and my score has gone up a little bit at a time. I think I will attempt to reread it again the next few days.
sjuniv32 - appreciate the note on the GMATClub ultimate book. I gave it a peek and looks like an excellent resource but don't think I've given myself enough time to fully internalize the content.
Also - writing this for any folks that have the same problem in the future. If you have some cash to spend, GMAC has a online resource with the OG questions that split out the sentence corrections into Grammar vs. Communication. I purchased the OG22 version and so far focusing on those questions really lets me see how the Grammar differs from the communication questions.
Unfortunately, Wiley doesn't allow you to export your per question performance into Excel. I think I will make a little python script to pull the data once I am done as I bet it violates the forms I signed.
Cheers.