I've done this same thing here in Vancouver, BC. I've even lowered my sensitivity as far as 75. Going back over nail/iron infested places I hit before with the HOT program and I've pulled silver coins and silver rings from 1"-3" deep that I missed before. Iron can mask targets very easily if you run the sensitivity and TX too high. Giving up depth to unmask the goodies you missed at shallow depths can surprise you.
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