What is your breakdown for what is happening in the verbal section? Are you getting particular question types wrong? And what are the subsets of the things you're getting wrong? For example...could be Sentence Correction - - noun/verb agreement.
For each section, we recommend in addition to the resources you're using you consider the following:
For RC, check how fast you're reading in WPM. 80% of the answers come from 20% of what you read, so you want to NOT get bogged down with reading, and instead employ speed reading techniques. This is best learned through a class b/c you need to practice under timed conditions. Students have an aver 13% score increase in JUST the RC by learning and using speed reading techniques, inour experience.
For SC, check out our book The Full Potential GMAT Sentence Correction Intensive
https://www.amazon.ca/Full-Potential-Se ... ntries*=0:
For CR, you can look at more questions from the LSAT to help you through. Learn to identify the parts of the argument.
It also helps to have an expert observe you as you answer questions. This provides a mirror of how you're answering and knowing what works and what doesn't.
Hope this helps! Feel free to write or call with questions.