Bobcats would be very difficult to trap in a live trap. I have trapped them with steel traps. Lots of good stuff can be googled up about sets done specifically for bobcats. A couple of tips I know of that worked for me is using a couple feathers, bit of fur, foil, etc. suspended from fishing line in the area of your set. in a way that it will flutter in the wind. It will give it a visual attractant from a distance. It can also be incorporated into the set to draw the animal onto the trap placement.
Also, note cats tend to have a route they like to follow. If you have tracks down one particular ranch road, pay attention, you will likely notice new tracks following the same route every day to few days. It is why you have seen the same cat at the same spot from year to year. Your best place for the set is very near or on that cat's hunting route.
And if using steel traps, set your pan firm. Cats, especially when investigating something will step very lightly and test the footing at first. With a light pan, you are less likely to get solid foot catches. If your catching them by the toe for example, you need to set the pans tighter. Cats respond well to step sticks and such to guide the foot placements too.
The problem with sets that use sardines and other smell based baits is that it is hard to not catch coons, possums, and other off target animals. I can do my best to describe my best bobcat set if decide to go the steel trap route.
This cat was one I would see bowhunting and in fact released an arrow in it once and missed it. I eventually went back and trapped it. It weighed 38 pounds. It is on my gun safe behind me right now. Mounted of course. I hope you get to catch yours. It is a lot of fun when you first walk up on the trapped cat and you see them transition from the flight to fight mode just before you send them to their maker.
This picture of course was a very long time ago.
