I have always in area where there is a lot of larger target like beer cans that give off a louder signal that sounds good is once I get the signal I lift the coil up several inches or a foot and if the signal dont change it is a larger target and move on. If the signal get weaker I dig. Doing this in a area full of beer cans from years ago (the older blue Hamm cans) from a well party site that was old and a lot of lifting the coil got some barber dime, 2 Walker half dollars and a old car emblem for a Cole Car that went out of business in the 20s, almost missed it as it was smaller than a beer can and it changed as I lifted the coil. It worked good for me with my Sovereign and also my Fisher F 75 when I had it. If you get a loud or large target alert I just lift the coil while swing the detector and raise it up and it the volume dont go down it is a bigger target and move on, just a couple of seconds to do and back to detecting..
Rick