I like a good challenge now and then too Fish, this is what I do when necessary:
The most effective method of landing a truly educated coyote is to move down 20' and make a blind scent set, perfectly blended. I like to find a clump of grass to use as the set backing. Use just a few drops of urine, coyote, fox, bobcat or mink urine will work or a natural urine/gland lure like my Nature's Call line, formulated for any of the above animals. If the trap is clean one will nab him within a day 9 times out of 10. Just setting traps back of traps works some of the time but i've seen them avoid a half dozen traps and still dig into the hole somewhere in between them. Good luck! Ace