Utfan1,
A couple years ago i thought i was having the same problem as you are having with pull outs. Come to find out i wasn't having pull outs they were actually rolling on my trap and setting them off. Are you using a gland lure? I was and i was puting the gland/call lure approximately 6 inches to the side of my trap on a qtip. I would have hair on my trap but not yote. I started putting the call lure 6ft-10ft downwind of my trap and i started catching coyotes. Unless you have a catch circle i would say that you may be having the same problem. I have educated a few that would come in and smell my trap and flip it over too.
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