I've been bowhunting and setting bows up for a while now, so let me give you a little advice. When it comes to a bowhunting rig, don't get caught up in the speed craze. The two most important things you want out of a hunting rig are accuracy and quietness. The best piece of advice I can give you is drop your draw weight to about 65#. You don't need to pull 70# to kill a whitetail. Dropping the weight will make the bow tune easier, which will make it more accurate and with less energy being dispersed at the shot, it will be quieter.

With your draw length being so long I would look at getting a 300 spine shaft and dropping your broadhead weight down to 100gr. With that long of a shaft you will be fighting weak spine issues and that is a big no no when it comes to a hunting rig.