When I first got into trad hunting I missed 5 deer in the first month. I was hunting with a Black Widow LAG longbow 64" and 58# @ 28" (I draw about 26 1/2"). On the last day of archery season that year, I had a spike come in at 10 yds. (I was about 14' up in an oak). Instead of looking at the body, I concentrated between the knee and the chest and let her fly. To my surprise, I hit the deer in the spine. Since then, I try and focus very low with the anticipation of the deer ducking into the arrow.
Also, if you do not bend at the waist, your shot angle changes and therefore the shot will hit higher than on flat ground.
In any case, sorry that you did not get your bear. Best of luck in the future.