Pay particular attention to iron bias. From the manual...
1. All ferrous (iron) targets produce a combination of a ferrous and nonferrous response. That's good to know.
2. A lower Iron Bias setting will allow the natural response to dominate which means that the target is more likely to be classified as a non-ferrous target. Or in other words a high iron false will sound even less like iron and more like a high non-ferrous target.
3. A higher setting will increase the likelihood that the target is classified as iron. In other words it deletes high tone iron falses AND coins when iron is in the mix.
Iron bias has the potential to cause trouble. The lowest iron bias resulting in the most iron false signals and the most frustration, remember it will emphasize the "dominate" response which is the high false. Pair the lowest iron bias plus with the highest recovery speed its a coin flip, it could be that the high recover speed can separate the iron from the coin, I predict 2 inch wide wiggle sweeps in this mode. Or because a high recovery speed means less accurate target information a high recover speed may result in more iron false signals, that if you lowered the recovery speed the additional target information may be able to more accurately ID the target as iron.
There are no problems, only opportunities. The above settings are the holy grail, max unmasking plus max target separation. The decision may be when to use them. If I'm working bone dry soil I'd try these settings and adjust from there. Bone dry soil shuts iron up, what is a huge iron signal in sopping wet soil, or a large iron signal in moist soil, in bone dry soil the iron gets much smaller. It also shuts up some iron falses. If the soil on a given day is wet, or moist, I might have to nudge the iron bias up a bit and back off the recovery speed a bit. The good news with the EQ is you now have that kind of control over the machine.
TRIVIA - The word Gain does not appear anywhere in the manual. Hey man, where's my gain setting lol I'll be scratching my head over that one for a while because Gain was a pretty useful setting for me on the Se Pro.