I don't think I would mess with success. If you are already having good luck with the placement that you are using..2" or so, I wouldn't change it. Individual animals will work the set in different ways, depending on all the varying circumstances, especially their past experiences and their sense of association.(and how hungry they are) I have caught a few easterns by both front feet and two by their back feet, so go figure. I assume the two I caught by the rear feet were in the proccess of leaving me their calling card, as evidenced by the fresh scat at the set site, I just happened to get lucky with them. I would go with what has worked best for you in the past.