I read in a review of the MXT that "In the Relic Mode, if the trigger is in the forward position, the MXT will "blank" out the ferrous targets. So. at a old home site, I set the MXT to Relic, Gain at pre-set, discrim at 3, and trigger forward. What happened was I targeted every square nail for miles around. None were blanked out. I tend to hunt old home sites, "ghost towns", and other areas with a lot of iron trash. Any suggestions on eliminating the low Iron signal? Tanks.