ok thats were a trail cam come in handy. from what i read there could be two problems .first back off a little from cover if you can, some yotes get nervous and refuse to go pass the safe zone meaning they refuse to work the set because of not being able to see all around them ..learned that from slim peterson and second try using what lure will stick to a tooth pick . to much lure will drive a yote away . now they will still work that set but it can take up to six weeks to cool down depends on how much lure you used. also try this as it worked for me use your main lure on a tree limb as a call lure and at your set use URINE ONLY.