I completely rewrote my essay, you have to figure that you need to try and improve everything possible. I would try and get more LORs if you can, but it's not the end of the world. You just need to approach this from the perspective that everything can be made better... otherwise we would both be sitting on acceptances right now, right? Good luck - oh yeah, make sure you get everything in crazy early (so long as you don't sacrifice quality). I think that is the single biggest change for my application this year.