GMAT Strategy

Hi, I have been prepping since October last year, consistently - almost every day with the prolonged study hours, like 3-4 (sometimes more) hours. I started at the scaled score Q 38 with GMAT Prep at the eve of my completing the MGMAT math strategy guides. I had not done any Verbal until the beginning of December when I joined e-gmat. In January I went through CR Bible (for the 2nd time and the 1st time it was in December), and I've completed Jeff Sackman's total gmat verbal CR part. I started off with RC in January. For RC I used raw testing - failure, Sackman's strategy - failure, a dozen of BTG and GMAT club tips - failure, finally achieved 75% accuracy point for average difficulty problems by solving LSAT RC passages and analyzing my tackling way of RC. I took GMAT in 2009 with little - and almost no prep, without going through OGs, little awareness of Geo concepts and many arithmetic, algebra, unawareness of CR at all and RC difficulty levels yes I've committed GMAT suicide once (Q25,V22).

Today's Q in GMAT Prep 49, earlier days - MGMAT 45 and Kaplan's 43 (don't ask me how I got to this point - thousands of GMAT self-beats, ton's of literature, piles of note pads with the solved questions ...)
Verbal - fluctuating between 24 and 29

I need advice per Verbal part - the main constraint here is timing, as I made 5 mistakes through question 21 today and then rushed myself down to the stoned mind approach for test within remaining 28 minutes.

Can I tackle my timing constraint, described above, by practicing individually CR and RC entries from GMAT and LSAT tough question sets during, say the left 15 days?

...Individually and without a time constraint I can delve into any passage and break it down.