First, What kind of site is this? Park? Farm field? Ball Field? Home site? How old an area? That might a difference on which mode I would use, and which settings to try. How much trash and iron signals? With old coins a possibility, It's hard to pass up any good solid hits at depth.....even the mid teens, which are likely trash. Solid 13's are where nickels like to be, but, those can also be tabs, foil, slaw, and gold. I don't pass on solid 13's anywhere I hunt. At trashy site, such as urban parks, I ignore everything up to copper cents except for the 13's, and only dig the upper numbers. They'll sometimes vary a number or two, but, I find gold and silver to be very stable and not bounce at all. Remember to recheck your hole before you fill it in. I saw in the one recovery where you had a mid to upper 30's I.D. and found a bottle cap. Not likely that it was making that signal all by itself. At least, I've never had a bottle cap read that high. Some screw tops are pretty close though. If this is a park or an area where it might be sensitive about evidence of digging, I'd leave the big digger at home and use a smaller hand digger. I'd also cut a 3 sided trap door instead of a full circle plug, and use a piece of plastic or towel to hold any removed dirt. Makes is much easier to get all the dirt back in the hole and a neater result. Lowering the sensitivity might help get rid of the extra false signals, chirps, and jumpy signals. Once you get used to them, it won't be much of an issue.
