Hello guys, please did somebody test what is the depth difference between the X70's Coin mode and the Prospecting mode to US quarter/Dime in the middle mineralized ground? With my Advantage I am able to pick up the quarter for sure in 10 inch. All metal mode is in my Advantage worse than Discriminate mode and I only use it for the Pinpointing. I also wonder if you are able to recognize those small rusty iron nails in the Prospecting Mode. Thank you for your time to answer!