Congrats, both on your success and on your ethics for following up so diligently.
I think you're smart to have the decoy at least partially downwind, especially when you are dealing with so much thick cover. Coyotes seem to like to circle downwind before they come in...maybe not so much when they're in the open prairie, but definitely in a wooded situation like yours. I know people hate them...I myself shoot them whenever I get a chance...but they have got to be one of the most challenging and rewarding game animals we have.