As I recall you took the SAT once before (or was it the ACT) and this latest score is a step change improvement. Since all SAT scores are reported, it might be best to stick with this latest score which shows a very positive change. Of course, taking the ACT with writing might be worth considering. You can choose to report it (or not) depending on the result - a composite score of 33 or higher would be worth reporting.
Now that you have met the GPA and test score credentials for Duke, visit the campus this summer. Talk with students, set-up an interview or two and then figure out what you can write in your upcoming essays that will set you apart - what's your hook? Also, figure out a strategy for your letters of recommendation.
Many applicants with 2300 SAT scores get passed over in favor of someone with a 2150 SAT score because the lower scoring candidate fills a need/gap. What sets you apart?