Scholarship Supporting Statement: Short&sweet or short& denied?

[bookofkels_]

So I got accepted to my top school (YAY!!) And they now I'm applying to a scholarship to cut my tuition fees in half, which would obviously be a great help, since it seems the Brits don't do full funding (or at least not for the MSc's I applied to). We're allowed a supporting statement of 750 words, and currently I'm at half of that, and feel like I've said everything I need to. Should I add/pad/expand? Include a memorable anecdote? The deadline is Friday so I don't have a lot of time, any advice would be super appreciated! 

Also, its only open to Americans, and I was kind of hoping there'd only be a small pool to compete against, but now I'm not so sure.