When we moved to this place a few years back, it came with 4 barn cats, with food being dispensed thru a self feeder in the barn. Quickly became evident was feeding more coon than cats. Set up a game camera and at one point documented 14 or 15 different coon in one night. Since it was summer took the opportunity to test some of these flavors thrown about........liquid smoke, vanilla, anise, fish oil etc. Set up a test with short sections of pvc pipe and filled them with plain and flavored cat food. Results were.......they had no preference........they ate it all, but always started with the first one they came to.
Have also run tests using a dirt hole in the woods and plain old cheap dry cat food.......the kind they sell in 40 pound bags for barn cats........or in winter........cat food covered in bacon grease.......high energy fat.......will draw in just about anything that wears fur. Coon, possum, skunk and fox and they will compete with each other for it. Have videos with three at same time waiting to get at it. Compared to what natural food they can find on their own........they love the stuff. They will go out of their way and travel a long way for a bite or two of it.
Fill a soup can or two with dry cat food, then cover that with bacon grease and set it out in a dirt hole where you want to collect them, give it a week and see what happens.