WHAT ARE THE BEST SETTING FOR COIN HUNTING

HI
friends
today i am going to tell you the best setting for Nokta impact metal detector for coin hunting...
mode DI3
Gain= 80
Disc= 25
FeVol=5
Frequency shift=01
 now go to Expert mode and do the following setting
NOtch= 25
now to the Audio tone in Expert mode go to 
Fe= 50
Gold/ non= 15
Non Fe=60
no go to tone brake
Fe=34
Gold= 60
Frequency= 5
in this sort of setting you will find nickle at metal id 30
diam= near to 78,77 or 69
zinc= 50, 52 or 49
this is the best ever known setting to me for coin hunting if you have Nokta Impact metal detector.
if it is helpful and you find something then please let me know or if you have best setting ,even then let me know.
thanks