Yes in my soils I can drop the Sens to 35% to run it as "a smooth ride" and it still hit coins in my test garden which were buried over a year ago at,,,, 6" ..
The high EMI seems to originate from our, neighbors WiFi's.
The At-pro doesn't seem to notice the local Emi in my test garden , and I run it 2 bars down from "Max".. which is groovy.
but then out in the relic fields you can kick in the Boost process of the Fisher, and wow off we go

I like the Fe3O4 meter for detecting old fire places as well..
Well good luck with the 75.
The At-P, the 705, F75, Etrac,, are all great machines and, lethal in the hands of an experienced users

HH
I know there are many great machines out there, if only we all had more money and could live to 150, then we could try them all