Took my Ace to North Central Pa for some digging. After getting some trash I dug up this. Very detailed pin This area of Pa was settled in the early 1800. I found this in an Open field at Hicks Run Pa.
I'm just north of you a little ways. up toward the butler area.
I use the Ace 350. I have hundreds of hours on the thing. It usually tells me what it thinks I need to know, sometimes it surprises me though.
I usually notch out everything below the nickel, sensitivity about three - four bars down. With the wet weather I"ve only been using two or three bars of sensitivity.
I've found that slowing down is more productive than any setting on my machine.