You should try not to move the trap about - rats take a while to get comfortable with new things in their surroundings. They're not stupid.
Think of it like this...
You usually eat out at an All-You-Can-Eat for $10 - the foods OK, nothing brilliant but you've been there loads of times and everything has been fine. (Just like the rats at your coop).
Then, one day, a new restaurant opens, it's way down a dark alley but the sign at the end of the alley says 'Free Food - All You Can Eat - and it's much nicer than the $10 place' You might walk down the alley a bit and have a look, wait the alley smells funny, a bit suspicious. You ask you're friends if they've been there before, no-one ever has. So you don't go there. (like your new rat trap)
A week later the new restaurant has closed down and another new one, looks much the same, has opened up on the other side of the road, another claim for free food - do you go? - probably not. (like your new rat trap, but in a different place)
So perhaps try this...
Get an old cloth, wipe up some chicken poo with it and then wipe it over your new rat trap - that should take away the 'suspicious' smells. Leave the trap baited but turned off until plenty rats know it's a good place to go and they've made it smell like well fed rats. Turn on the juice.
Sit back and laugh at how easy it was to outsmart the most likely mammal to survive a nuclear holocaust.
You are now deeply entrenched in a war of attrition - their sheer numbers vs your patience and cunning. Semper Fi.