I'm not OCD on scent but I do wear leather gloves to set and separate gloves for bait. I would use a kneeling pad or ground cloth for setting. Cavens makes good bait and lures. I also use Down South Trappers products and they are here in Alabama.

Try putting in a compass set. It's best to put it on sign, where they are trotting a road or trail. Find a.clump of grass for backing and punch a hole with your rebar. Bed your trap 7-8" back then punch in 3 more holes the same distance from the trap on the compass points. Add bait or urine to each hole. I'd put your Cavens in the hole at the base of the grass and the urine in the hole closest to the line of travel. Add a and or curiosity lure in the other holes. The goal is to get the coyote moving his feet as he checks out the scent.

Sometimes I only use 3 holes with an open approach over the trap.