When i first started out i was strictly distress....but over the years i play less and less of it. I rarely start a stand with it. I have learned that studying coyotes and learning more about them has been the ticket to calling. I am 85% vocals now.
Learning more about the time of year, and the coyote yearly cycle has helped me trigger more of them. 2 years ago I would walk into a field i knew coyotes were near and I could play PT "Bad Brother" and if they were there, they were on the way! This year i dont know if i have had 1 dog show up to it. Such a weird and interesting thing to me and thats what keeps me doing it.
Last year we hunted a tournament here in Michigan and we killed 12 dogs in 2 nights on 3 sounds....We only played 3 because the dogs would show up on the 3rd sound every time! It was mind blowing to us! 3 weeks later we couldn't buy a dog with those sounds!
My point is that maybe playing the wind more, knowing more about where the coyotes are at, getting closer to them, knowing more about the food source etc. may be helpful. And my favorite line "Dare to be different"! I've killed a lot of dogs on fawn distress in January...ALOT! And ive played chicken distress in the middle of a cow pasture before and had success. Sometimes you just have to find that tone that triggers them.
Get into some of the podcasts out there. FoxPro podcasts (Especially the episodes with Torrey Cook), Overdrive Outdoors Podcast, Etc. There is a lot of great information to be had there. Its free to listen to them and some of the information is gold! Especially to a predator hunter!
Good Luck!!