I am using 70 lb draw weight as well, but I use full length arrows 32 inches. I don't shoot groups with the actual Rage broadhead's, I use the practice tips. But I am not shooting for groups with them any longer, I was just checking accuracy.
I also shoot at further distances, 20, 30 , 40 and 50 yards. I am still getting great accuracy at all 4 ranges. 95% of my shooting on game with my bow has been under 40 yards, that is just the type of area's I have hunted. My bear hunt is going to be 20 yards or less from the ground.
Good luck on your bear hunt. Are you using your bow?