One of the most effective baits for tom cats is fresh catnip put on the ground, so it's in the center just past the trigger. I hope the trap you are using is not a two door Havahart. Those are useless IMO. If you do trap him, he can't be neutered and just plunked onto a strange farm unless he's conditioned to the area by being caged for a month or so. Otherwise he'll be driven away by the other cats. He sounds like one tough old scrapper who's fighting to survive.