Matt,
You might try some of Jim Grahams Double Cross bait or Craig O'Gormans Powder river paste bait. They are both great on what you are looking to catch.
Some of the best lures I've found were the ones advertised as being designed for use with the M-44's or Getter guns. I put a good smear of the lure on a piece of wool and drop it down a dirt hole set. My dirt holes are dug with a 1.5" hand auger. The coyote has to dig to reach the wool. The longer he has to hang around digging, the more likely he is to still be waiting for me in the morning. 
