I am thinking of purchasing the AT Pro.I have many Metal Detectors. I have noticed that many people are having a lot of problems pinpointing some objects.If this is true can anyone tell me if there is a coil that pinpoints better.I do a lot of parks and tot lots.I have been on U tube and it seems that the detector works fine,but some are having difficulty finding their targets.I also notice that people dig rather large holes.Why is that? I never had to dig any more than three inches around the target.Please let me know if you have any of these problems.Thank you