Hey, I just took my GMAT today and I got 50Q and 24V, very similar to your score. I understand your frustration. The math part was pretty easy for me as well, but I was lost on the verbal part, in partucular the RC.
However, I have to say that I spent 2/3 of my preparation on math and 1/3 on verbal. That's probably why I had such a low scored on the verbal. I am not sure. I just didn't think that the RC could be improved because to me is a matter of how hard is the passage presented.
Also, I used Kaplan and now I know that the Kaplan CATs overstate your score, as I was getting in the high 600s, low 700s.
Please advice.