Dont OVER complicate it. You can do and spend a whole lot to tune your bow in as perfectly as you can get it... and all that is good, don't get me wrong.. But all that is not necessary to kill whitetail. Find the distance you can consistently shoot at, and then hunt to that distance.. be it 15 yards or 30. Don't go cheap on broadheads, read some reviews and buy a good one, ultimately that's what's going to kill your deer so don't buy the $10 Kmart special.
-Jake