Coyotes and wolves are natural enemies. Wolves will push coyotes out of there territories. Perhaps you can work off of that natural rivalry to draw them in.
Otherwise, if you're in areas where there are wolves primary prey (e.g. whitetail deer) you're bound to see wolf sign. But because they move in and out of areas on their hunting routes, it's likely a matter of timing as much as anything, if you see them.
From hearing my uncle Harold talk about trapping them in the early part of 1900's, when it was legal to do so. Timber (Grey) Wolves are one of the smartest predators and toughest to trap or I imagine also hunt. They are very much aware of any threats, smells or sign of humans.
I can't say much else. Wolves have been a "protected species" here in MN for about 3 decades, like the rest of lower 48 for some time. Only now are they supposedly being delisted where some limited legal hunting of them "may" be allow at some point in areas where there is much wolf human interaction. They'll likely still prevent the people here in NE MN to hunt them or protect their animals though. That would make too much sense.