Mr.sandman. the vaquero doesn't loose depth nearly to the extent that you are talking about. I have found older small cents at 8" with the disc on max, I should note that the signal was a mere crackle and it didn't change with the disc on iron. The only reason I dug it was that I knew it was small and deep in the AM mode while still registering at max disc. The older tesoros suffered alot when it came to higher disc settings but not so much on the newer machines.
I can completely understand using high disc when I have only a few mins to go out and detect. If I have only a half hour to hit up a park, why spend it digging trash when I could simply put the disc up a little higher and come home with a few more goodies. I think that is something 95% of the members on here are guilty of.
Cladder, you can expect to find any copper, silver, loonies, most clad, and any larger objects.