I had the same problem. I did all the EK 101 and my AAMC scores were substantially lower. I don't think Kaplan VR would help that much bc I've heard it is more dissimilar from AAMC than EK. I've now been getting consistent VR of 11 on AAMC by doing a few things. I don't know which actually helped but here they are.
Read this forum:
http://forums.studentdoctor.net/showthread.php?t=223930
Read at least 3 articles for the economist every day while I wait for my coffee to kick in. ( Read the boring ones about the new DPJ blah, blah, politics, blah, blah... they're so boring that a AAMC VR passage will make ou salivate)
Follow the VR method for EK to a "t"
Take longer to read and understand the passages; that way you'll spend less time having to go back.
Make a decision and stick to it... Most VR questions that are not from Natural sciences passages can have the question narrowed down to 2 choices... pick the best one and
don't convince yourself otherwise!