Retaking the GMAT after exhausting all resources

I have been placed on the waitlist for one of the schools (top 10) I'm applying to. I know my GMAT was one my weakness (680 Q47 V37) so I will be taking it again in 3 weeks. The last time I took it was ~3 months ago. I have already done all questions from OG13, VR2, QR2, GMAT Prep Default & Question Pack 1 (except for ~80 problems). I have also already taken all 6 MGMAT CATs (along with 3 retakes) and all 4 GMAT Prep Exams (along with 2 retakes). With all these resources exhausted, how should I prepare for my upcoming test?

I feel that the last time I took the test I may have gotten burned out because I was doing and reviewing so many problems everyday. I was also doing applications for 3 top 10 schools at the same time I was preparing for my last attempt. Leading up to the last attempt, I was also taking 2-3 CATs a week. I took the actual GMAT 4 times over 4 months. My scores with dates were:

09/14/2013 - 600 (Q39 V34)
10/15/2013 - 660 (Q44 V38)
11/16/2013 - 680 (Q47 V37)
12/20/2013 - 660 (Q49 V32)

I will take it much easier this time around, but I'm not sure how to find a balance. I also don't have an accurate gauge of my score now because I've done all the good CATs I know of. I think my main problem was that I read too many different Verbal strategies and tried to use too many tricks and shortcuts. I lost focus on my Verbal fundamentals, which probably directly caused my low Verbal score on my last attempt. I will work heavily on that part this time around.

In general, how should I balance my time between fundamentals, concepts/strategies, practice problems, and CATs?

Thank you in advance for any advice you can provide!