Appreciate your sharing photos of your digging tools. I’m interested in hearing more about how you Modified your coin poppers. Did you preheat the screwdriver or cold forge the bend? Being cautious about using digging tools in public spaces I do probe for my target after I locate with a carrot. Deeper targets I’m passing on it for now. I was shown many years ago by illustration from a senior member a technique for coin popping. A standard screwdriver and a second handle for leveraging the popping the target.
I have observed that conditions vary often as to how much depth my equipment reaches. My guess is that finding a target in previously hunted exact location was perhaps a missed opportunity. Better day or conditions for detecting? Either way I found something where I have covered before. Think a tuft of grass in a bare section of park lawn Inches down.