Given your score, you should be fine. When I talked to one of my professors, I asked him whether the General GRE is important. He gave me a flat-out "It doesn't matter as long as your score is not awfully bad". Subject is important, but your score is decent enough to compete for top 20 programs (where I am now). I also had a writing score 4, and I got into a top 30 program, but my major is math though, not stats. Good luck!