I would bet that your GRE scores really don't matter if your proposal and essays are well done. They are really rewarding the fellowship based on potential as a graduate student (they're not even really rewarding this particular project; as we all know, you don't even have to carry out the one in your proposal). The GRE doesn't really tell you much about a student's potential to think about and do science (or related work), just how well you can take a standardized test.
For what it's worth, I got an HM last year (one E/VG, two VG/VG on my ratings sheets) and my GRE scores aren't that stellar.