Respectable 710 (Q:47, V:41) One Month After a 640. Retake?

I have perused the forums on here and have found the information insightful and inspirational - thanks to all. I wanted to share my GMAT journey (hope it will be informative) and I wanted to seek some retake advice. Here's some background re: GMAT journey: I studied for one month mainly using the fu...