It can depend on the property, but I usually hunt with a lower iron bias and if I'm a bit suspicious of an iffy high tone I'll bump up the iron bias and see if the high tone holds together. If I'm in an area where that's happening a lot, like an area full of nails, then with the 800 I'll copy the settings to the user mode and make that iron bias adjustment. The result is a one button toggle between a low and high iron bias setting.