abudabashiniba

I am currently apply to mathematics grad school. Concentration on Algebraic geometry/topology. Undergrad: top30 private Undergrad GPA: 3.13/4.0 Major GPA: 3.58/4.0 (My gpa of first two years is a mess. I had health issue one semester, which prevent me from going to class. If exclude that semester, I got major gpa:3.84/4.0.) I took 17 upper-division math/stats courses among which 10 are grad level. GREs：160v+170q+3aw; 740 sub(67% TAT) Research one senior honor thesis on low-dimensional topology(some original idea on knot theory); one summer research in a foreign institution. LoRs: one strong letter from my thesis advisor, who also taught me 4 courses, including two grad level courses, and 2 seminar; other two from course instructors who taught me grad level courses. I just wonder if I have a chance to get into top50 grad school on math or not? I applied for/will apply to: = USC, WashU, OSU, UW-Madison, UIUC, UVA, Duke, UCD, Michigan State, Gatech and Rutgers. I've contacted some professors in related area. Some said my thesis was interesting and worth future research. Also some told me to notify them when submitted. Is that a positive sign that I have a chance to get into their school? I believe some committees will throw away my application right after they see my GPA and GRE sub? so what can I do to improve my application?