Hunting Goldies or any modern parks I'm in program 9, Now discrimination is not the key mate. Rather than try and discriminate out the smaller coins get to know them. You can then decide if its worth your time to pick them up.
Once you identify the 5-50 cent coins its easy to identify them with the Deus and decide whether to leave or grab them if shallow.
Grab a few coins before you go and practice on them just before you start. The coins will almost always be the same in the field with very little if any variation, especially when shallow (under 3 inches) and thats 90% of your spendies. If its 2 tones off a coin tone it's NOT A COIN 100% guaranteed.
Example if its a dead 64 its a 90% chance it's a 10 cent piece. There is a pulltab right there too but most times he will do what I explain next. But sometimes he doesn't the little Bastar%. if it tones over to 63 or 65 that goes down to about 10% 62 or 66 and its ZERO chance of being a 10 cent coin. It's that close man.
The other advantage is you get used to what trash sounds like. That way when you get a 52 or a 54 (a 5 Cent piece will be 53 in 18khz) you know its 90% not a 5 cent, then depending on signal strength, area your in, time on your hands, etc etc etc etc you can decide to dig it up and see what it is or walk past and check it next time.
Once I ID the local trash targets I can walk past them and pluck spendables out of the ground all day long with minimal rubbish if I choose. But being the curios sort I dig a lot of non coin based tones just based on Audio clarity or gut feeling or wind direction or mood or whatever it is.
I hope that makes sense, the only thing I discriminate out using the detector is iron, MAX I ever use is -3 I don't mind hearing it because often when you find a concentration of it there are some good targets in amongst it you can eek out.
The brain is a powerful analytical tool and if you smash it with fulltones often enough it just works it out, i still believe the brain is the best discrimination tool in your arsenal.
Let the trash talk to you mate it will give itself up a lot of the time and you can walk on by.
Clegy