My advice to a client in your position would be to go with your current GMAT score and concentrate on emphasizing the other very strong aspects of your application. The longer an applicant has been out of school, the less weight a GMAT score carries. Fully employed programs also tend to have lower overall GMAT scores because they are pulling from a much more geographically limited applicant pool.

Putting together persuasive essays is much harder and takes much longer than you expect. You have so much to say for yourself that you should focus on your application. An experienced admissions consultant can make an enormous difference in helping you craft essays that put you in the best possible light. If you can afford such services, you should seriously consider it. My clients regularly admit that together we have gotten them acceptances to schools they would not have gotten into on their own.

Your target schools will see very few (if any) PhD's with strong pharmaceutical backgrounds. Your industry is so hot right now that they should be excited to get someone who can bring your level of insight to the classroom.

One last point. You will need strong supporting recommendations. Many recommenders need a month to get their responses to the schools. Also, some schools are much slower than others in forwarding transcripts. If you have not done so, you should take care of both of these items as soon as possible.

Good luck,