Unless the snow that you found all the tracks in was really fresh, I'll bet that thereweren't as many coyotes making those tracks as you think there were. One coyote can make a lot of tracks in an area. Also,the hole that you found by following the tracks, may or may not be a den, BUT this time of year, coyotes don't necassarily return to a den daily. And depending on how large the territory is that the coyotes live in, they may not be in that same area daily. SO, your "bait" deer may not be found for several days. Once they find them, they will eat them quickly, with in a couple of days easily, and quicker if there are several coyotes.
The clear lense on your spot light won't scare coyotes, unless you shine it directly on them, and even then, some coyotes won't be scared off by the light. When spot lighting them, try to keep the light above them, just so you can see the reflection of thier eyes.
If you haven't called them in and educated them, you can keep using any call to call them. Once you call them in a time or two, and they learn that the sound you are making means danger, then you will need to change calling location and/or sounds.
The best way to see truely how many coyotes there are and where they are is to get out there directly after a fresh snow, but even then, a coyote or two can leave a lot of tracks in a small area very quickly!