Honestly with your set up I would not shoot mechanicals. I say this because I don't know what speed you're getting and what your arrow weight is. Mechanicals expend a lot of energy entering an animal, even a whitetail. This could result in an incomplete pass through and a harder blood trail to follow. Now I'm not saying that they wouldn't easily kill a deer because they would. But a high hit like from a tree stand without a pass through leaves a very sparce blood trail as the animal usually bleeds out internally. My suggestion would be a cut on contact broadhead like the Magnus Stinger, Slick Trick Viper Trick, or Muzzy Phantom. With my choice being the Viper Trick.