I ahve a club here in South carolina that is seeing the same thing although they enjoy the hogs, i would suggest you let some of thee guys come down and hunt them and maybe contact some of the trappers down by the water shed on the border .
when i lived in the upstate area of south carolina i got request to go to NC to killhogs all the time and never really put a dent on them. dogs , catch cages and still hunters are what you need to get rid of them