I had an XLT. It never gave a correct ID on a dime beyond 4.5". Many will tell you it should detect coins much deeper, which it will. However, some say bouncing ID? That means trash! But in even average soil, the XLT IDs will bounce all over. I had dozens of detectors that did just that, & others bragged about a lock-on ID at 8" or even 12"-16". But others said you have to dig everything. Made me feel like quitting the hobby as I didn't want to dig everything or just get clad.
People told me their secret settings, but I couldn't get anywhere near those without the detector beeping constantly. It was like it was detecting it's own circuitry or something. When I set it to be stable in the house, it could detect a dime at 7.5" in disc mode, 10", maybe 10.5" on a half dollar. But no accurate IDs in ground beyond 4.5" dime, 5" quarter.
I think the detector maybe wasn't meant to get accurate IDs deep in all ground. I sent it in to the factory, they put on a new coil. But it wasn't any better & thought they should notice that.
One XLT user in bad ground area said he gets better depth with the 8" coil than the 9.5" coil.
White's still has this problem with the Prizm/(new) Coinmasters. ID jumps some at 3" & jumps at 5" more, with it being possible to guess probable coin only to 5". Almost all Prizm owners complain about the jumping, but say they get no jumping with the 4x6 DD coil.
One XLT owner said they use the all metal non-motion mode (toggle switch forward), which is about 40% deeper than the motion mode. They said if it seemed round & about coin-sized, they would dig. Best wishes & HH, George (MN)