I had a park caretaker explain to me one time, about what the city authorities don't want. Once a person M'detecting left the park looking like the gophers made a bunch of holes.
Because of this, I find pinpointing more important and starting small...maybe just a slot and pulling it aprt wider some. Anyway, leaving gopher-like holes is not acceptable to authorities.
I bought from Kellyco recently a heavy duty digging trowel, 2" wide to enable me to dig smaller and deeper in parks now. The screw driver with a teaspoon just wasn't getting down deep enough for some good targets. I think the teaspoon might still be a good idea for getting dirt up, if the spoon is bent some so the dirt doesn't drop back into the hole. Maybe add or attach something to it, for a long handle.