Switching to a 125 will slow your speed down a good little bit. Somewhere between 3-8 FPS BUT it will give you a greater KE value. Which broadhead do you currently use? If you want a superior fixed broadhead I would advise Slick Trick in either the Standard, Magnum, or Viper in the 125. Excellent Broadhead that flies very well and the performance on game is unquestioned.