Hi sensitivechins.
Since you are using TTP for quant, for sure, you should also be using us for verbal also. We've had countless students use TTP, for both quant and verbal, and those students have really kicked butt on the GMAT.
While I understand what you are saying about taking notes and highlighting, the TTP course has a notes feature that you can use to take notes on any text that you highlight as you go through the course. Meanwhile, the GMAT itself is presented on a computer screen. So, practicing answering questions on a screen is optimal.
Overall, in allowing this notes and highlighting issue to keep you from using the TTP Verbal Course, you are depriving yourself of the use of a very powerful resource. To give you a sense of what I mean, a student came to me having trouble with Sentence Correction. I practically begged him to use TTP Sentence Correction, but he kept saying that he had already used a variety of Sentence Correction resources and, thus, knew all about Sentence Correction rules, etc. So, he doubted TTP SC would teach him anything new. Finally, after spending additional months not making progress in Sentence Correction, he decided to use the TTP SC course. The next time he took the GMAT, a week ago, he got all but one Sentence Correction question correct, for a 98th percentile SC score.
So, I would encourage you to use the TTP verbal course and figure out how to address the note taking and highlighting issue in another way.