Hello,
Don't get discouraged! It seems like you are making progress... with each test, you are improving! Kaplan always appears to be tougher for most people so I wouldn't let a less than desireable score get you down.
Seems like you are focusing on Kaplan materials. Have you taken a look at Princeton Review Books? I felt that that was kind of a nice way to get started taking the tests timed tests. It included a lot of useful test taking tips.
When you take practice tests, do you finish with a lot of time left, or not enough time?
Do you think that you studied for so long that maybe you overprepared and are burned out?
Are you really stressed out when you are taking the exam?
I'd say defintely look through the solutions for all the practice sets and really understand how the questions were solved. Specifically, look at what time saving things did the solution have, what approach did the solution take to the problem, etc. Know the basic question types and know the general apprach to solve them... Then work on speed and timing.
I'm also shooting for around a 700. And right now the books I'm using include Kaplan 800, PR Verbal, and 10 Actual, Official LSATs.
Also, be sure to have a template for the AWA. In my opinion, it really saves from stressing out prematurely on the essays.
One final thing, you have a great deal of work experience. And, from what I gather, that is a big plus. You'll have a lot to offer a B-school in your professional experience. So, don't discount that!
GOOD LUCK!