You are referring to the 5" coil and DP mode = delta pitch tone? or are you referring to BP boost process or DE default mode?
Typically a coil will go as deep as it is long (or wide if concentric) on small targets. I have found the F75 to do a bit better. Larger targets = deeper hits.
You might get 18" on a pie plate.
Long or wide? Charlie............10x5 DD?
I used this set up today in a very trashy part off the park and found that Confederate cuff link today. I’m gonna try that FA mode soon.
I would recommend you set no notches at all and discriminate only to 7 or so for iron.
Use the readings to rule-out crap. Gold jewelry will hit around where the pulltabs do.