Depending on the angle I think you want to hit right at the shoulder crease (or slightly behind) for a broadside shot. You're not wasting any meat with a bow (its just a blade!) and can hit into the shoulder muscle without issue (just don't hit the scapula). Next deer you kill take a knife and stab the center of the shoulder right after you find it. You'll be surprised how easy it is to get through if you don't hit a bone.
Theres no difference in killing a deer with a trad bow, a compound, a crossbow, a spear, a knife, blow gun...whatever. They all kill by hemorrhage (bleeding). Cut the important bits and stuff bleeds, then it dies.
If you are in fact hitting deer in the right spot with a sharp head. The trails should be more than adequate, with a good chance of the deer falling in sight.
How are the deer reacting on at your shot? If they don't react then its easy to tell where you hit. If they do react its really easy to misremember.