I just bought the Ace 300. I am having a hell of a time finding anything after signals. I sometimes dig 14" to no avail. I have an extreme amount of false positives. I get a strong signal, start digging, and it goes away. Very frustrating. I am digging in an area that has power lines around it. Is it a sensitivity problem? I have read the manual and to me it's not clear. How should it be set? And how high a number on a signal should cause me excitement to dig. 40-50-90? I watch these videos and when they get a signal they pull out a small trowel and find a gold coin. LOL. I know it's not that easy, they are looking for subscribers, but I could use any advice. Thanks in advance.