I've had some experience with 2 of those machines, not the Deus but the ctx and etrac, and honestly, there just comes a point sometimes when sites are simply way too trashy to attempt splitting those subtle machine hairs. If it was just a matter of trying to eliminate the iron then no real problem in doing that, or, if it was simply a matter of highly meneralized ground then there are, perhaps, some better machine options for that condition. However, this is a situation of just way too much crap in nearly every form of metal one can encounter, and it's literally piled up everywhere. Sad that it turned out as it did but that's the way it goes sometimes. I have absolutely no doubt that you could skim the first foot or two of soil off the property and the situation would get no better. In most areas I could put on the small coil, put the machines in all metal/pinpoint, and it would often sound like a machine gun during the sweep, aluminum, iron, copper, nickel, and so on and so on.
Time for the backhoe and a sifter/classifier! 
