Welcome to the forum and thanks for your posts!
Regarding your triple vs. double major, as mentioned in previous posts, there is little marginal benefit that law schools will give for a triple major.
The key to life and success in the law school applications process is efficiency. As DTrossen accurately states in his excellent email, time spent studying for the LSAT is the best time you will spend in getting you to the law schools you want. Because these 3 months of intensive studying (the course outlined by DTrossen is an excellent program) will have more impact than your 4-5 years in college.
Whether they admit it or not, most law schools (except Berkeley's Boalt Hall) look at your LSAT score first and foremost, even above your grades. There is so much variation in grades between colleges and even amongst majors in the same college. For example, there is much less grade inflation in the Sciences than other majors. Thus, law schools prefer to quickly view one standardized test score than wading through a transcript.
Thus, use your extra semester for LSAT preparation, not your third major. I do recommend taking an LSAT class, and I find http://www.testmasters180.com
and powerscore to be the most highly regarded. I taught for the Princeton Review and found that the materials are decent, but not great, also true of most of their instructors (present company/writers excluded of course).
Take the LSAT in October if you can get in the proper studying by that time. October is nice because you can get your applications in early (ideally your file, including LSAT score, is in by mid November) and if you do not do as well as hoped, you have the December test as a second opportunity.
Those who take the LSAT in February really hurt their chances for your score is not available until very late February, when many admission slots have already been filled. Whether explicit or implicit, most law schools have rolling admissions.
You definitely will have a compelling and unique personal statement that will be a big plus while applying and set you apart from the masses. If you have not yet done so, review my article on writing your law school personal statement:
http://www.top-law-schools.com/law-scho ... ments.html
Unfortunately, I will not have the time to review your personal statement even though I know I would enjoy reading it. Between my trademark law practice, two daughters, and working on writing a pre-law book that I would like to get published, there is little time to do anything else. However, in the article on law school personal statements I include a link to Essay Edge, which does an excellent job reviewing and editing personal statements. I had my read and reviewed by many professors, family members and friends, you want it to truly be reflective of the best writing you can do.