Ive been trying to get coyotes pics as well with no luck,and in a well coyote populated area.I've used dead possum,beaver,and possum,with no yotes.I've had bobcats,hawks,and buzzard pics.The bobcat pics have been cool though.When I used corn for deer I would get like one coyotein every 100 pics.They must just know better.I'm going to try some birds next.
Good luck man,
James