Those are some good looking bears you have coming in. You should try putting the hole higher up on the barrel. If you do that the bears can never get the bait at the bottom of the barrel and will stick around longer trying to get at it. I use chain binders to keep them from ripping the barrels around also. They can get a little unhappy when they can't get their food.

I had one get my barrel loose from a tree before I used binders and I never did find the barrel.