Your biggest obstacle may actually be running out of questions to practice. I'm no expert on the kind of studying you'll have to do, but here is what I would do in your situaion.
If you're really serious about this, then you should order EVERY test (the two 10 real actual lsats books will help with cost). Also buy a few strat books (read reviews or ask around for the best ones), and start off by reading them, then figure out with some untimed and then timed sections what works best for you. Once you get your technique down, stick with it, because you need to be as comfortable with the test as possible. The increase you are talking about is far from impossible, but it won't be easy either. My intuition is that with very serious work, a good means of releiveing stress, and enough questions, you have a shot at it. Good luck, and don't hesitate to ask if you're having any problems, as I'm sure everyone would be happy to help you.