I have 6 bears and bow kills with them as well. I hunt with Eric and Maria
www.bouleaublanc.com in Forestville Quebec
All of my bears fell within 10 seconds with a lung shot. Normally run 20-30 yards just like a deer.
Blood trails were always solid.
The biggest thing to be careful with. The belly on a bear has lots of fur. You can't put an arrow along the lower elbow like you can on a deer and expect that heart shot.
Bears have lots of fur and the body belly area is hard to judge.
You have to come back behind the shoulder in the middle of the body.
6 inches behind the shoulder. Stay away from that lower shoulder pocket area. GOOD LUCK!