At this stage, I wonder if you started working on the essays or not. If you haven't doesn't it seem too late? It may not shine through and you may suffer from that - just an opinion.
And yeah, without any other parameter than the GMAT, its not going to be any valuable advice. And on that 710 GMAT - it is just there to be considered a candidate, but a lot depends on other parts of the application (incl. essays).
Think about it. Application fee is not cheap, but not that prohibitive either!!