When there's lots of food around, lynx (and I presume bobcats) can be almost impossible to reliably catch in cubbies. A hint of exposed bait - like a bunny ear, something that makes them have to get in the trap to see it - sometimes works.
I set most of my traps 4-5 feet out from the back of my cubby. They seem to like to walk up and look in, and I can play that game too.
Bait, lure, attractor changes don't seem to make much difference, as long as you're using something reasonable in the first place. They go in or they don't.
Just put the trap where they want to go and don't try to force them.
I hang lots of snares in years that I have this problem.