A simple answer often begins with another question.

Do you care about finding nickels, or not?
If not, then turn your dual control knob past nickels/pulltabs and go on enjoying life because there are no other coins located in that part of the VDI scale. However, and that's a critical however, the MXT won't notch... meaning you'll miss everything
below that point (about +24) on the VDI scale. That's where all the high-carat gold jewelry resides. (If it's a solid +8, dig it. is good advice.)
I suggest leaving the discrimination (dual control knob) set between 3 & 4 to mask out iron (everything below VDI = 0) and just ignore that dreaded pulltab range (+18 to +24) if you're really opposed to digging pulltabs. However, (there's that dreaded however again

) you're going to forego many valuable targets by doing so.
Without stealing your thread, I'll leave it there. If you'd like to discuss it sometime, send me a PM with your phone number and I'll call you this week. I'm in PDT, so tell me what time is best to call.
(BTW: You're using the absolute best coil that White's ever made for all-around hunting.)