Well, that's a start. Once a coyote gets a good wiff of ya, he ain't comin' back no matter what noise ya make. On the other hand, if they only spook because they saw ya move a little bit, you might get them to come take a 2nd look, just depends on the coyote.

You got way more patience than I do. Most coyote will show with-in 7-9 minutes, many times much quicker. I rarely sit in one spot for more than 20 minutes.