Also! I noticed wayyyy less iron falsing in the all metal mode too. Just wanted to throw that out there.....possibly why you have such good luck in the iron infested areas? Something interesting.
Over time I think lots of this has to do with perception and how our brains process the data we receive through our eyes and ears.
I hunt many sites over and over using different settings and it always amazes me how I can usually find one more great target on one hunt when I completely missed it on others.
Could be luck, could be hitting it from just the right angle in that one instance but not every time because lots of these sites are small areas in parks or tiny lawns in my neighborhood that I have gone over dozens and dozens of times from just about every conceivable direction possible under all kinds of conditions so I believe the settings have a lot to do with it.
I have used all metal with blasted out settings, high disc, high thresh, monotone, multi tones and DP and several combinations of them all and each one has found me targets I, and in public sites countless others, have missed.
This is why I look for and practice hard so many different settings, more arrows in the quiver as it were.
One thing I believe is even though I have had tons of experience hunting with settings so chatty and jumpy that others I hunt with are amazed I can target good signals at all in that mess, on settings that are quieter with less distractions I think I have found more.
The detectors are just machines that give us tones and numbers and behavior according to their programming and it is up to us to decipher what they are actually trying to tell us with the clues they give us...which may be a bit more hidden and not exactly obvious every time.
That I call learning the language and there is more than one for every detector out there IMO.
It may well be the quieter and less distracting ones we can process better, easier, and not pass by masked and strange acting targets we would on another day.
For me this all metal hunting method is quieter and more stable with great indicators, as jumpy and noisy as it still might be, so it works for those that push through the initial confusion and into the realm of understanding.
I discovered this all metal hunting method quite by accident one day, it was in an area that to this day was still the most difficult pulsing, noisy EMI filled site I have ever hunted.
I constantly switch between all metal and disc to check targets and at this place I was hunting in disc but checking a few in all metal.
Both were extremely jumpy but after checking one target using all metal I forgot to switch back to disc and after finding several more targets fairly easily I realized what I was doing and how I was doing it...and that it was working better than disc.
From then on I used it more and more and honed it down until eventually I tried it in a site with insane amounts of iron and trash and discovered it worked best of all the settings and methods I knew to that point.
Serendipity...now it is one of the sharpest most accurate arrows I have in that quiver and in my mineralized and iron infested sites I now hunt a primary weapon.
Like with most things the more you use it, practice it and learn to understand it the better you get and the easier it gets but you seem to have a good handle on it now so I expect more great reports, and treasure, in the future.