Hey Elton, sorry I must of missed this one before. In this particular case, I was in an area that has produced some good keepers for me in the past, and I try to hunt slow and through. I ended up digging the first indian head because it was at the right depth more than anything, plus from my past experience this how some keepers have come across. I then dug the next two because they sounded like the first one and were only a inches apart.
About the successful question, I guess it depends on how you define successful. Because trust me, you don't have to dig "horrible" or "iffy" signals to pick out the keepers with the Explorer, that's just the thing, the machine is so great, that I didn't do that for many years, I became a professional cherry picker and only dug silver (good 4 way hit sounded signals only), But the problem with that is I was missing what the others have missed as well in the past. Heck there were days that I wouldn't dig anything but silver (maybe not much of it, but I choose to only dig that) the Explorer can be that good (and that bad at the same time - its all up to the user) what I mean, is since the Explorer separates signals so well, once you get to understand the machine more, you can pick and choose what to dig or what not to dig.
As of late last year I STOPPED my cherry picking methods and have begun to really hit the Explorers true potential, digging the coins that others have missed. You wouldn't believe what some people could do with the Explorer, once they have put the time into it, they can go into an area that others have just pounded to death and pick some keepers, sure I dig more trash now, but my places are not "hunted out" for me anymore because of my change. Heck if you got "virgin" territory, I guess there is no need, but as for me, all the places I hunt have been hit thousand of times by many people over the years with various detectors.
I hope that helps. I am still learning all the time and I am loving it!