I have, but its been a while.
Im not sure about notching out everything to 20 however!
Perhaps I will try 5Khz again.
Thanks for the advice.
My old parks are loaded with a lot of trash, and recently I was really pressed for time, as the sun was setting fast.
I had great luck, it in multi frequency, 6" coil, turn the sensitivity down REALLY low (10) , and did very well down to 4" or so, even with extremely tiny objects (back of an ear ring).
I was very surprised on the performance by simply backing off the sensitivity.
In about 1 hour, I located a gold ring, silver ear ring, back of an ear ring, another piece of unknown jewelry, and a small handful of clad coins.
And by simply reducing the sensitivity, the machine ran extremely quiet, and allowed me to travel much quicker than normal.
Probably just luck, but I was impressed on my finds, in such a very short period.
I believe its going to be my new default park program, for the time being.
Thanks for the advice on the 5khz, and I will try it again, soon!