perhaps the 5x8 is lest affected by EMI interfearance and pinpoints much better?. I dont yet have a 5x8 coil for my AT pro and have been using the large stock coil.When I tried to use the normal custom mode the Detector goes ape.When I put it in the normal coins mode it settles down quite a bit but I am getting signals on the ends of my swings and I am not lifting the coil on the ends of my swings. Also pro coins mode acts up as well. Are all of the pro modes hyper sensitive?