I use size #1.75 and #2 double coil spring traps. Add some jaw laminations and you will not have issues with leg damage. I've held bobcats over 30lbs and released housecats unharmed with these traps.
As far as sets, I use flat sets and dirtholes. I set high traffic areas such as logging road intersections, field edges etc. My flat sets normally have a visual attractor such as a rock, log, etc. I bait them with gland lure and urine. Dirthole sets, similiar to bushdog, I use fresh or slightly tainted meat with lure and sometimes urine. Good luck