Brandon, don't feel bad; I haven't found any in my yard either. I did find a wheat yesterday mixed in with a trashy signal. I wasn't going to dig but the area I was hunting wasn't givin' up anything and I thought what the hell. I found a '53 Wheat buried about ten inches. Yes, ten inches... and I pulled out some foil and then a small green stone, it is cut on one side and round on the other, no ring, just the stone. I don't know if it's glass or what but it was cool and surprised me. I guess I'll have to check the rest of the yard to see what else may be in there. Funny, I never buried anything back there and this stuff was buried, I also found a perfume bottle which was really neat and it still had perfume in it.
What I tried was this: I have the 5 x 8 coil on my AT Pro and instead of wrapping the cord close to the bottom of the coil I brought it straight up to the tightening screw and tapped it there then started to twist it. When I took the machine to the yard I ground balanced it and that read 80, as I walked through the yard swinging there wasn't a sound, nothing. Hell I thought it came unplugged; it was that quite, then it started to talk when I hit targets and that sucker was going deep and the ground was really dry. I had sensitivity only down one notch too. Give it a try and see what it does for you; it really worked for me, on this soil anyway, and it is a red clay.