I wonder if the wire causes avoidance ever
When catching feral cat kittens and small feral cats a four way trigger is more effective. They try to slink through the wires. They just bump the wires and are caught. At least that is what I have found.
There is a video somewhere, maybe Clints, that shows beaver coming up to a 330 and going around. Some of it I believe could be the smell we leave behind when adjusting the wire trigger on an exposed set. Some times it is not all bad to have the smell on the trigger, just needs to be the smell you want and where you want.
I know I can put castor on the trigger wires and catch bobcat and beaver. Got video showing it. The bad is when you set a positioning set with a cage trap where the lure gets on the trigger and the animal fires the trap prematurely by smelling the hanging trigger wires that were contaminated. I usually spray the trigger wires with a no scent mist to help. Here is a picture of a trap I just set with a camera to test. Bait is in two different locations. One on the front (left side in a dirt hole in the trap and one at an angled dirt hole on the right side. The set is made so that the animal will be completely in the trap when he works the dirt hole bumping the trigger. If the wire trigger is contaminated the animal may get missed if he smells and touches the trigger not going to the dirt hole first.
A pan set up would not work as well in positioning the animal I don,t believe because there is no visual guide.
I know how the wires are configured, guides the animal. I learned that one from Newt, years ago, when snaring otters. Just a blade of bent grass on the bottom of the loop will keep the otter from going under the snare and direct him into it.
I believe in a baited set the bait just needs to be prevalent over the wires. On a forced set, wire configuration that he thinks he can squeeze through, works best. Especially on a run where he is moving at a clip. Not just for the distraction from the wire trigger, but the distraction from the shape and presence of the trap, itself.