I've called enough to know there are no fixed rules. Sometimes even the generally accepted guidelines seem vague. I've found that camo isn't that big of a deal*, for example, and neither is it critical to replicate the exact sounds of the distressed rabbit** or whatever. Still, if I understand your post correctly you are approaching your stand from the downwind? Well, if it works for you that's what counts.
In general we always approach a stand from the upwind so that the wind is at our back when calling. This allows the coyote to scent the stand (we take a lot of care to minimize scent) and most often the coyotes come in from the downwind side (OK, I've had them come in from all directions, depending on the wind velocity and stand location).
Another technique I like is to call in cross winds because the coyote will often circle the stand into the scent and that exposes them for a bit more time. Here we try to set the stand with our backs to some type of barrier, like the side of an outcropping or draw.
*Several us used tie dyed shirts or white T shirts with much success on a four day hunt. One guy thought he would best us an used a Santa Claus costume, sitting fully exposed on the side of a hill. He did well, too. My opinion is that absolute stillness is the most critical thing. We averaged 40 to 50% success ratio, the same as when using camo or ghille.
**Years of hunting jackrabbits with a .22lr has allowed me to hear the dying distress sounds of wounded jacks on several occassions. They all sounded different as far as pattern, but, similar as far as the raspiness of the vocalization. I took a fellow worker out for his first calling trip and thought he would pattern his call after mine -- wrong. He just blew steadily on the call, almost nonstop; it sounded horrible. I knew the next 20 mintues were going to be long, but, guess what? We had a pair of coyotes come in. They didn't leave.
I've used step ladders, tree stands, crouched under junipers, sat in the open with a ghille, called long and short, new moon and full moon and have concluded that the "rules" for calling coyotes are fairly loose and, at best, we can make some generalizations. Some of my calling buddies do things very differently than I as far as calls and techniques, yet, they have similar success ratios. I believe we have to be cautious about stating what works and what doesn't.