Since you have a foxpro and it seems you call okay on a diaphragm; try to wake them up with some howling, then switch to some soft distress calls including some "Lucky Bird" and like sounds.

Hunting coyotes in thick cover is difficult - I hate to say it, but I bet they came in and busted you ??

Coyotes get educated quickly, so don't do anything the same.

Expect them to come in to your set-up from down wind - so plan accordingly.

IMO the mornings are better, because no one wants to go to bed hungry ................ !!!

Good luck bud.