Both coils were used with same setting, sens.at 7, vol.at 10 , and disc. at 4. Bottlecaps vid at 39 with the iron icon flashing useing the 8" coil and the signal broken.With the 11"DD the bottlecaps vid between 88-94,no icon flash,sounded like a good target, clear sharp signals,would be digging that target,wouldn't have been digging the signal from the 8" coil. Anyone else notice this difference ?