I've had the same experiences. With coyotes, a little calling goes a long way. With bobcats, they quit coming when the sound has stopped for very long. And they are very bad about hanging up in cover. Plan on shooting them in the edge of cover because they are very, very reluctant to come out in the open.

I have also had good luck with higher pitched calls. Most of my higher pitched calls sound like smaller animals, which makes the bobcat think the meal will be easier.

I prefer to hunt bobcats at night. Bobcats aren't active during the day if it is very warm outside. And if there are bigger predators around, the bobcats feel a little safer walking around after dark. And since they hang up in cover, they are hard to spot in the daytime. At night, their eyes shine like crazy, so when one comes up, they are easy to see.