If you successfully completed the the OG 12, then don't redo it; focus on the OG Verbal and OG Quant instead.
Your math is pretty solid, so you need to just identify some weak spots and work on question practice. Do all of the
GMATClub tests, not half of them.
The verbal section is the main challenge here. Re-read the Manhattan SC guide and go through the Powerscore CR Bible. Just keep reading them over and over. The OG Verbal guide is necessary, but the questions are too easy. To compensate for this, look into some LSAT LR and RC questions. For SC practice, try to fully answer every single SC question on the GMATClub verbal forum. And by "fully answer," I mean provide you choice and defend it thoroughly (why, for example, option A is correct and why the others aren't).
You seem to have done a number of CAT's. Test practice is important, but don't sacrifice time better spent on reading guidebooks and question practice.