@ Sugar
Thanks for setting up this "challenge" it's a real treat LOL to see everyones results and hear their feedback on settings used and why. Very informative for all

I have always used conductive sounds w/variability @ max with the OCCASIONAL foray into 2TF. Its what I've gotten used to and along with a slight disc pattern provides me with the most info possible. Max variability allows for the most variation between target signals, therefore more info per target. I set the thresh pitch fairly low aswell (11-14) which changes the target response in multi tone...
I try to guess before I dig, sometimes I'm right but I do get fooled often enough. I go by sound primarily and use the screen/numbers for added confirmation. If I get a repeatable signal in disc but its "iffy" or jumping around I switch to quickmask/all metal. If the signal "cleans" up and fe #30's is predominant then I usually pass but if the fe #'s bounce into mid 20's or teens then I'm digging!
I use a modified pattern mostly that accepts down to 27 fe. This allows non fe objects to jump out of the iron trash and say "HERE I AM" case in point: I got a signal that was reading 25fe-46co on every sweep... I turned 90 deg and NULL... decided to dig and about 6" down was a decent looking 1916 barber dime w/a rusty blob right next to it. The coin still has rust stains on the leaf side. I didn't check the signal with 2TF but I'm almost certain I would have got a low tone (iron) and would not have dug it up. If I had been using the stock coin pattern, I would never have heard a tone at all.
Ok, I hope I answered your question

now here's the kicker

I may have "cheated" a bit on the challenge, you decide... for the purpose of the challenge, I created a very tight disc pattern to insure that my 1st six targets were coins... I blacked the screen in QM, loaded that as my pattern, went to edit and accepted fe #'s 9 thru 15 only on conductive #'s 36 thru 47 (very tight)

after I got my six coins, I took the postit note off the screen and went to a very open disc pattern only rejecting iron and some falsing (fe#1 line with the exception of co#40-47) in 1 1/2 hrs I dug 23 coins (including 1st 6) a piece of foil, 2 pieces aluminum scrap, and a rusty screwtop...
Sorry for so long of a post LOL
HH