First off I would want to know how much descrim you are using, tell us about what your pattern is like, then second open up you pattern a tiny bit and see it it starts to read. You do indeed get different readings between the 2 settings. Perfect example, In High trash you are going to get a 01/41 or there abouts for a half dollar and a 12/47 in ferrous coin. So you can see if using the same discrimination pattern for both settings you may miss it with one of the settings vs the others.
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