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AWA 3.5 is at the 29th percentile, and that's not terribly bad for an international student. If you're looking at top schools, I'd be slightly more concerned over the Q score (=790) than the AWA score. It's well-known that there's a lot of subjectivity in the AWA section. I've known great analytic writers (journalists; philosophers) who receive a 4.0 on AWA. And if you look at the profile threads, scores from 4.0 to 4.5 from top applicants (or 5.5-6.0 from rather weak applicants) are a fairly common occurrence.
Retake if you think you can improve the Q score significantly, or both the Q and AWA score marginally. I don't see the sense of a retake simply for a small chance of getting higher on AWA, unless it truly doesn't reflect your ability (but it seems that it does). Your time is better spent on crafting a well-written SOP, which adcoms will most likely read more carefully after they see your AWA score.