One thing to consider is what are you hitting in the deer...and what is the relative size of the deer? Are you hitting ribs? Shoulder bones? Large heavy muscle? Are the deer 200+ pounds? Or closer to 100?

Also what type of shots are you taking? Are they broadside or quartering away?

If you are killing the deer quickly and getting a good blood trail, then you don't have a whole bunch to worry about. One thing you could try, like others have said, is a heavier arrow. If you bow is tuned properly...and it sounds like it is, then that is what I would try.