If you want to get more speed out of a bow you need to advance tune it. I have done several of them including mine. It involves changing the strings, cutting down on the servings. Adjusting the bow to all the correct specs. Then add speed nocks. Teak the timing, single cam or hybrid. I just did a bow that was pushing 278fps to 280 ish. When we were done and it did take some time it was doing 291fps. Every bow will give you its best if it is set up for its best.