I too have an at pro and havent had my racer long. If your coin hunting three tone mode sensitivity as high as you can get it for as much depth as possible. Drop your id filter to 5 to help keep from iron masking. I just ordered the small coil and itll be here tomorrow or thursday. So ill let you know more on this when i get time to experiment with it. You are gonna get a lot of 82 signals dig them. Bottle tops are kinda tough but if you work a good signal good you can almost tell with the front tip or back tip of the coil. Itll iron grunt but still dig some just to make sure and get a feel for it. Ive been running tracking on because i cant find places to ground balance because of all the iron. I havent noticed a loss in depth with tracking on. Overall im happy with my makro racer so far it is really nice.
at pro both coils, makro racer, and detectnix pinpointer.