Hardin, I've hunted deer and elk in Unit 9 and I saw coyotes in just about every outing that I can recall. Although I didn't specifically hunt coyotes, I'm sure both Units 9 and 7 would serve you well. I've done a little coyote calling in Unit 7E, with decent results. Get nearer the Navajo Reservation boundary for best results.
The only downside is the heavy population of Flagstaff and the probable hunting pressure from varmint hunters who live there. I'd give it a crack this coming September - if'n I were you.
Being a bowhunting I've always been fanatical about scent control. Whether it's sprays, carbon clothing etc. I've tried it. The best thing that I have found for eliminating human scent is Betadine. It's been used in hospitals and homes for decades as a defense against infections on minor scrapes and burns. It can typically be found near the pharmacy in any of the major "one stop shop" stores, and a bottle will last multiple hunting seasons.
Before every hunt possible I...