while the ace 250 is a great machine, the gti 2500 is far superior! the problem is most definitly not your machine. could it be too much discrim? hunting too fast? not overlapping swings?or like was just mentioned,not digging enough targets? i know on my 2500 the target id section is so detailed that it kind of lulls you into believing it is telling the truth every time. sometimes its not!