is your trap a Havahart? We've had great success with those, but ONLY after fiddling a bit with the trigger bar on the outside- bending it or whatever so that there's a quicker response to a smaller movement of the floor plate that trips it- small cats wouldn't set it off for the longest time, we'd watch them mosey in, snork all the food, clean up leisurely, and stroll out, never set it off- then I did some adjustments and made it REAL sensitive, and THEN we got ALL the feral kittens and finally their mom and the assorted boyfriends too! Had to use a drop-trap to get Mom, she was a smart cat, caught three litters worth of kittens before we finally caught Mom-
BLESS YOU for what you do-- this world really needs far more folks like you- those critters don't know how good they're gonna have it! Keep up the WONDERFUL work- Godspeed-
Bowlkat