Your most important setting when trying to achieve DEPTH is your Sensitivity...in any machine really. The machine has already acquired the signal,now it’s a matter of HOW MUCH OF THAT COLLECTIVE SIGNAL do you want to hear? I AlWAYS recommend using the biggest coil you have,again...for ANY machine in fairly clean ground when you want to achieve DEPTH. None of this has to do with mineralization,trash,EMI,etc.,although they can all certainly be factors. However,those are “individual site” factors,of which we as forum members know nothing when it comes to YOUR sites. When going for “the gusto”...Sensitivty as high as you can go and still interpret what is going on...and a huge coil!