Sounds like a decent, yet disappointing run last year. Sorry to hear about the dings / waitlists. Given the fact that you received an interview and a number of waitlists, I'm inclined to think that your issue is around execution -- specifically regarding essays and interviews. Have you picked up our book Your MBA Game Plan
? It should really help you with strategy development for the application process.
The schools you mentioned are clearly within your reach given your results. It's not a GMAT issue -- it's an application issue.