Well....Yotes are very very very smart and sometimes they will hide in dense cover and not come out till they see something moving so a decoy might make your life eaiser, but no gurantees . But yes if you overcall them they will get wise...fast. So make all your moves calculated and watch the amount of rabbit distress. Try the Coyote pup in distress call(if you have it) sometimes that brings out parental instinct and works well in many situations. Also if you have deep snow a coyote may not think a rabbit worth chasing after if he is going to be outrun if that is the case try a fawn in distress call. That works very well in mid to late winter. Hope you have a change in luck.
Happy Hunting,
Sam