Dave
I have the same deal. I won't have any hog sign for a month or two then go out one morning and find an acre tore up. I work away from home so most of the time they seem to be long gone. I can get them to come to a corn feeder a few nights then gone. Sounds like you have some trap shy hogs. A guy that traps a lot of hogs swears by grape jello in the corn. I have tried several things , beer fermented corn, pancake syrup, just plain corn seems to work best for me.
