So I've had my omega 8000 for a few weeks now and am still learning the machine. Been reading what other people have been using, so I've been running with disc at 16-20 most the time, 2 tone. I've also noticed that I don't seem to find any coins like that, at least not many anyhow. Keeping in mind I'm mainly using my 11"DD. Today I was screwing around with settings some more and figured I'd try disc at 0 and 2+ tones. I pulled 2 bucks in clad out of an extremely trashed (lots of iron and foil) area in about a half hour. This machine does seem to do awesome in heavy iron now, its like a machine gun going off with the sound of the iron popping as I swing, but as soon as it chirps in the 80's I know I've hit something worth digging I just need to pinpoint it a little better.