Wehave spruced our baits with ansine oil (licorice extract), usually pour it onto on rotten logs or stumps and it gets hammered hard. Like mentioned it lasts for a good period of time as well. Maybe worth a try if you have a spot that has bear sign already.

Like mentioned the other option is their natural food sources, since they are already patterned/conditioned to, is always productive to factor this into what ever you may add to the setup.