Whatever arrow you choose to go with, it needs to be a 300 spine. I've given this advice to a lot of people and you can take it or not, with your draw length I would turn the poundage down to 65# and shoot a 340 spine arrow. You don't need to pull 70# to kill a whitetail. Your bow will tune and shoot much better at 65#. The first time you try to draw on a whitetail after sitting in sub freezing temps for several hours, you will thank me. Don't get too caught up in the speed hype.