ST,
The OG11 gives plenty of verbal practice. My 1st suggestion is that you go through the questions again. Take your time and for each wrong answer, find out exactly why it's wrong and write it down. Try to avoid uisng vague reasons such as "it sounds bad" and stick to the rules.
Consider using a study source that divides verbal into specific sub-topics (ie Modifiers, Verb tense, or Weaken/Strengthen in CR) and that allows you to focus study on individual topics at a time. I used gmatfix verbal flashcards for this and they worked very well for me. MGMAT guide also does this quite well.
To see the specific verbal sub-topics and strategies that worked when I prepped for the test, see my debrief at
www.tinyurl.com/gmatpost
