I hear this alot and I personally experience it are we doing something wrong here?? Like for an example when I hit a wheat penny at 6 inches and there's no trash around the ID still jumps from 50-72?? it will sometimes hit tab then zinc then dime? Am I doing something wrong?? I have the 11" DD coil on it and it's supposed to be more accurate and stable so this should help but it still jumps alot????? Any help would be greatly appreciated.