MD Success, Of A Sorts

Went on a hunt yesterday in a new location which is the success part of this post. I've made 3 recent requests thus far for permission to search private property. One politely said "No" while a second seemed open to the idea but has not responded back (made two visits, will not venture a 3rd but left my contact info).

So I discovered an owner that I lived near in my old neighborhood, took a chance and knocked on his door. Explaining my purpose for the visit he rather quickly said "Sure". His brother owns the lot next door and also agreed. Total area to search is 4 acres of an area that used to be farm land in the not too distant past. Four other homes nearby with similar acreage. If they see me at work, maybe they will stop to ask me what I'm doing and open more doors.

I've only search less than one half of one front yard but only uncovered junk (see pic) thus far. Still hopeful for some interesting finds. Can only manage a 3-4 hour search before I'm worn out.

My approach has been to ignore the really low ( < 6) and really high (199) numeric indicators. I was getting a lot of signals ( I'm assuming lot of iron in the ground) but few were relatively consistent. Unearthed those in the constant 25-80 range.

1. Maybe broken horseshoe
2. Shotgun shells
3. Junk foil
4. Thought it a spoon bowl but after cleaning doubt it

I eventually put the detector in discrimination mode but still got lots of signals, most of which I ignored. So, my fellow diggers, how would you have approached this search given the little info I've provided? Am I totally off base?

Gear: Bounty Hunter Discovery 3300, GP-Pointer (< $14 at TEMU), K-Bar knife (from my Vietnam tour)