Why more speed ? Most shots on game are less than 25 yards and the deer will never know the difference . As long as your bow is accurate , don't get caught up in the fps game .
Speed isn't everything but... I was shooting about 260ish with my old setup and now shoot 305ish with the new setup. I am not going back to 260!!!
300 is the new 260 with todays bows. IMO