I am having trouble calling in coyotes and foxes?

I have just become a hunter this past 2 years and have gotten dear, squirl, and chipmunks, i've been wanting to get a coyote or a fox but have not been able to, i live in northern michigan and live right in the woods, ive used jackrabbit in distress calls, cotton tail in destress calls, woodpecker in destress calls, coyote howlers, and even coyote pee and meat such squirle and chipmunks, Can anybody help me to find out what im doing wrong, and i also dont know what the rite time to hunt coyotes/foxes, thanks for the help....