Having recently attained what I consider success in the admissions cycle, I think what I would emphasize amidst all of this great advice you're getting is not stuff like your scores (what compelled me to respond is really that our numbers are unsettlingly similar! In any places we differ, you actually performed better than I did. To think our roles could so easily have been reversed if numbers mattered so much...). Admittedly, I went to a high-ranked undergraduate program, my field is Renaissance, and my adviser is, as professors go, fairly well-known in the field. Yet I think the success of my application was a concept one of my advisers directed me toward: coherence. The overall package of my application presented as much of my intellectual development as possible, and emphasized my particular strengths. This centered on my writing sample. I was not confident, at first, in my writing sample and personal statement, but I expended so much sweat on them that I honestly believe they pushed me through the gates of some great programs. Here's my suggestion:
Theory, or at least a knowing nod to theory, is pretty important. Knowing (and also being able to close-read with a sense of historical purpose) non-canonical literature also helped me (though this may be less significant for studies in Modern). My writing sample was a chapter of my honors thesis, but I opened it with a survey of the theoretical techniques and touchstones I utilize throughout my thesis (such as speech-act theory, languages and political thought, etc.). I also noted the most important figures in my theoretical development right in my personal statement, a sentence or so each. This formed discernible links between my personal statement and my writing sample. In my statement, I was also sure to list 2-3 (sometimes 4) professors at each school. One Renaissance, at least, but also at least one (in whatever field) whose theoretical approach I could relate with.
The next step is to demonstrate to the people writing your recommendations how you've developed this broad-scope theoretical approach. Impress them with your reading of certain theorists, ask them for opinions on which theorists and what literature you should consider. Also ask them for which faculty members you should include in your statement. This is all stuff, I think, they'll remember to put in your recs, as well.
Honestly, you have everything you need to get into a top-20 school (I only applied to those, too). The "coherence" approach worked for me, and I think it turned out a pretty good application. Very best of luck.